# US 11,441,320 B2 · Separating membrane with improved adhesion and process for obtaining it

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,441,320 B2
- Document ID: US11441320B2
- Status: Granted
- Kind: B2
- Application number: 16/794,808
- Filed: 2020-02-19
- Published: 2020-06-25
- Granted: 2022-09-13
- Earliest claimed: 2015-01-27
- Applicants: Tema—Technologies and Materials Srl
- Inventors: Federico Cais; Nicola Busatta; Renato Pavan
- Web page: https://patentgrep.com/patent/US11441320B2

## CPC

- E04F 15/182: {Underlayers coated with adhesive or mortar to receive the flooring}
- B29C 48/002: {combined with surface shaping}
- B29C 48/0021: {combined with joining, lining or laminating}
- B29C 48/0022: {combined with cutting}
- B32B 3/263: {characterised by a layer having non-uniform thickness}
- B32B 3/28: characterised by a layer comprising a deformed thin sheet {, i.e. the layer having its entire thickness deformed out of the plane}, e.g. corrugated, crumpled (B32B29/08 takes precedence)
- B32B 3/30: characterised by a layer formed with recesses or projections, e.g. {hollows, grooves, protuberances, ribs (apertured layer B32B3/266; layer with cavities or internal voids B32B3/26)}
- B32B 5/00: Layered products characterised by the non- homogeneity or physical structure {, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts}
- B32B 5/022: {Non-woven fabric}
- B32B 5/20: foamed in situ
- B32B 5/245: {another layer next to it being a foam layer}
- B32B 5/26: another layer {next to it} also being fibrous or filamentary {(relative arrangement of fibres or filaments of different layers B32B5/12)}
- B32B 5/28: impregnated with or embedded in a plastic substance {(not used)}
- B32B 5/30: one layer {being formed of particles, e.g. chips,} granules, powder
- B32B 7/06: permitting easy separation
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 27/12: next to a fibrous or filamentary layer
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- E04F 15/186: {Underlayers covered with a mesh or the like}
- B29K 2023/065: {HDPE, i.e. high density polyethylene}
- B29K 2105/04: cellular or porous
- B29K 2509/00: Use of inorganic materials not provided for in groups {B29K2503/00 - B29K2507/00,} as filler
- B29L 2031/14: Filters {(optical filters B29L2011/0066, sieves or screens B29L2031/737)}
- B32B 33/00: Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
- B32B 37/0076: {characterised in that the layers are not bonded on the totality of their surfaces}
- B32B 37/182: {one or more of the layers being plastic}
- B32B 38/06: Embossing
- B32B 2250/02: 2 layers
- B32B 2260/021: Fibrous or filamentary layer
- B32B 2260/044: Water-setting substance, e.g. concrete, plaster
- B32B 2264/104: Oxysalt, e.g. carbonate, sulfate, phosphate or nitrate particles
- B32B 2266/025: Polyolefin
- B32B 2270/00: Resin or rubber layer containing a blend of at least two different polymers
- B32B 2305/022: Foam
- B32B 2307/538: Roughness
- B32B 2307/718: Weight, e.g. weight per square meter
- B32B 2307/724: Permeability to gases, adsorption
- B32B 2307/726: Permeability to liquids, absorption
- B32B 2307/73: Hydrophobic
- B32B 2307/732: Dimensional properties
- B32B 2307/748: Releasability
- B32B 2323/043: HDPE, i.e. high density polyethylene
- B32B 2419/00: Buildings or parts thereof
- B32B 2419/04: Tiles for floors or walls
- B32B 2471/00: Floor coverings (B32B2419/04 takes precedence)
- E04F: FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS (windows, doors E06B)
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES

## Abstract

Separating membrane of plastic material, made up of a bossed and waterproof sheet which is coupled with a permeable base layer. The bosses are of the cylindrical type with a double diameter and have such a shape and arrangement as to feature improved adhesion on both faces. The gripping of the adhesive is increased in order to obtain greater tear strength, on the upper face, and at the same time increases the area of contact with the base layer for a greater resistance to delamination on the lower face. In particular, inside each chamber there is an internal crown, which divides it like a necking into two superimposed compartments having the same diameter, wherein the first compartment has a depth amounting to at least ⅓ of the total. A production process for obtaining the membrane is also disclosed.

## Claims

### Claim 1

A process for forming a separating membrane, the process comprising:
extruding a raw material so as to form a waterproof sheet, the raw material being at least one thermoplastic material or a mixture of polymers;
forming the waterproof sheet around a forming roller, the forming roller being bossed and having protrusions arranged in a matrix with a constant pitch, the formed waterproof sheet having cylindrical bosses with a constant height, the step of forming comprising:
forcing the waterproof sheet around each of the protrusions, the protrusions having a constant height of between 2.5 millimeters and 7 millimeters, the forming roller forming at least one main notch of a continuous cavity form which is orthogonal to side walls of the boss, the forming roller forming two folded and joined edges that protrude toward an inside of a chamber, the main notch having a width of at least one millimeter and a height equal to twice a thickness of the formed waterproof sheet; and
coupling a base layer of a nonwoven fabric to a lower side of the formed waterproof sheet.

### Claim 2 (depends on 1)

The process of claim 1, the main notch having a rectangular shape, the step of forming further comprising:
forming an internal crown with edges flatten one on top of another and extending substantially parallel to the forming roller.

### Claim 3 (depends on 1)

The process of claim 1, the main notch having a triangular shape, the step of forming further comprising:
forming an internal crown with a lower edge inclined by 45° with respect to an upper edge which is in a direction parallel to the forming roller.

### Claim 4 (depends on 1)

The process of claim 1, wherein each of the protrusions of the forming roller has a secondary notch with a lateral cavity shape at a base of the protrusion, the secondary notch subdividing the protrusion into four superimposed portions.

### Claim 5 (depends on 4)

The process of claim 4, the four superimposed portions comprising:
a first cylindrical portion having a diameter between 13 millimeters and 18 millimeters and a height of at least 0.5 millimeters, the first cylindrical portion corresponding to the secondary notch;
a second cylindrical portion having a diameter of 20 millimeters and a height between 0.5 millimeters, the first cylindrical portion and the second cylindrical portion defining an upper compartment of the chamber;
a third portion corresponding to the main notch, the third portion forming the internal crown; and
a fourth cylindrical portion having a diameter of 20 millimeters and a height no more than ⅙ of a total height of the protrusion, the fourth cylindrical portion forming a widening underlying the internal crown, the third portion and the fourth cylindrical portion forming a lower compartment of the chamber.