# US 4,397,706 A · Method for making molded articles

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

- Number: US 4,397,706 A
- Document ID: US4397706A
- Status: Granted
- Kind: A
- Application number: 06/360,568
- Filed: 1982-03-22
- Granted: 1983-08-09
- Earliest claimed: 1974-05-24
- Assignees: West Corporation
- Inventors: Roland M. Allen; Andrew J. Kalocai
- Web page: https://patentgrep.com/patent/US4397706A

## CPC

- B29C 43/183: {the preformed layer being a lining, e.g. shaped in the mould before compression moulding, or a preformed shell adapted to the shape of the mould}
- B29C 31/066: {using feed frames, e.g. for dry material}
- B29C 43/04: using movable moulds
- B29C 43/146: {for making multilayered articles}
- B29C 43/34: Feeding the material to the mould or the compression means {(B29C43/085 takes precedence)}
- B29C 70/68: by incorporating or moulding on preformed parts, e.g. inserts or layers {, e.g. foam blocks (mould constructions therefor B29C33/12; joining preformed parts by moulding B29C65/70)}
- B29C 70/80: Moulding sealing material into closure members {(placing sealings in closures B21D51/46)}
- B65D 51/002: {Closures to be pierced by an extracting-device for the contents and fixed on the container by separate retaining means}
- B29C 2043/046: {travelling between different stations, e.g. feeding, moulding, curing stations}
- B29C 2043/3422: {rollers}
- B29C 2043/3618: {plurality of counteracting elements}
- B29C 2043/3623: {coupled on a support, e.g. plate}
- B29K 2021/00: Use of unspecified rubbers as moulding material
- B29K 2105/256: {Sheets, plates, blanks or films}
- B29L 2031/565: {for containers}
- B29L 2031/7494: {Pistons}
- Y10T 156/107: Punching and bonding pressure application by punch
- Y10T 156/1072: Closure cap liner applying type
- Y10T 156/12: Surface bonding means and/or assembly means with cutting, punching, piercing, severing or tearing
- Y10T 156/1317: Means feeding plural workpieces to be joined
- Y10T 156/137: Stamp from multiple row sheet type
- Y10T 428/26: Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- Y10T 428/31536: Including interfacial reaction product of adjacent layers
- Y10T 428/31707: Next to natural rubber
- 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)
- B65D: CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- 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
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Disclosed is a method for making articles comprised of a body portion of an elastomeric material having a liner of an inert material covering at least a portion of the peripheral surface of said body portion including the steps of bonding a layer of elastomeric material to one face of a layer of the inert material, positioning the bonded layers in a mold cavity with the layer of inert material contacting at least a portion of the surface of a mold cavity, adding additional amounts of uncured elastomeric material to the mold cavity and curing the elastomeric materials. Also disclosed herein is a system and apparatus for making molded articles as well as the molded articles produced thereby.

## Claims

### Claim 1

A method for making articles comprised of a body portion of an elastomeric material and a liner of an inert material covering at least a portion of the peripheral surface of the body portion consisting of the steps of bonding a layer of elastomeric to one face of a layer of the inert material, forming at least one clad element of a predetermined configuration, positioning the clad element in a mold cavity with the layer of inert material contacting at least a portion of the surface of a mold cavity, adding additional amounts of uncured elastomeric material to the mold cavity and curing the elastomeric materials.

### Claim 2 (depends on 1)

A method as claimed in claim 1, wherein the bonding of the layer of elastomeric to one face of a layer of the inert material is without the interposition of an adhesive therebetween.

### Claim 3 (depends on 1)

A method as claimed in claim 1 wherein the liner is a flexible, non-metallic member and wherein the positioning of the clad element in the mold cavity includes flexing the clad element so that it does not lie in a single plane in the mold cavity.

### Claim 4 (depends on 1)

A method as claimed in claim 1 wherein the layer of elastomeric material is cured after bonding to said layer of inert material and prior to positioning the bonded layers in the mold cavity.

### Claim 5 (depends on 1)

A method as claimed in claim 1 wherein the layer of elastomeric material is uncured rubber and the layer of inert material is Teflon which is chemically etched on the face thereof bonded to said rubber layer.

### Claim 6 (depends on 1)

A method as claimed in claim 1 wherein the layer of elastomeric material and the additional charge of elastomeric material added to the mold cavity are natural rubber.

### Claim 7 (depends on 1)

A method as claimed in claim 1 wherein the layer of elastomeric material and the charge of elastomeric material added to the mold cavity are synthetic rubber.

### Claim 8 (depends on 1)

A method as claimed in claim 1 wherein said clad element is of circular shape and of a diameter greater than the diameter of the mold cavity adjacent the bottom thereof so that when the clad element is positioned therein centrally thereof, the outer circumferential edge is turned upwardly to form a circumferentially extending return flange in the finished article.

### Claim 9 (depends on 1)

A method as claimed in claim 1 wherein a plurality of clad elements are formed during the forming step and transferred and positioned as a group in plural cavities of a mold.

### Claim 10 (depends on 9)

A method as claimed in claim 9 including the steps of loading the clad elements in a loading rack and positioning the filled loading rack over the mold cavities and transferring the clad elements from the loading rack to the mold cavities.

### Claim 11 (depends on 10)

A method as claimed in claim 10 wherein the clad elements are of generally disc shape and the loading race has a plurality of openings to receive said discs, each opening having a pilot portion of circular cross section and a reduced throat section defining a seat for the disc.

### Claim 12 (depends on 10)

A method as claimed in claim 10 wherein the clad elements are supported in openings of the loading rack by friction.

### Claim 13 (depends on 11)

A method as claimed in claim 11 where the diameter of the pilot portion is preferably equal to or greater than the diameter of the disc and the throat portion is of a narrower diameter.