US2442405A - Synthetic plastic pad - Google Patents

Synthetic plastic pad Download PDF

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Publication number
US2442405A
US2442405A US681401A US68140146A US2442405A US 2442405 A US2442405 A US 2442405A US 681401 A US681401 A US 681401A US 68140146 A US68140146 A US 68140146A US 2442405 A US2442405 A US 2442405A
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United States
Prior art keywords
pad
synthetic plastic
plastic pad
creasing
thermoplastic
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Expired - Lifetime
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US681401A
Inventor
Ralph W Fornwalt
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Individual
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Priority to US681401A priority Critical patent/US2442405A/en
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B1/00—Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
    • D04B1/22—Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes specially adapted for knitting goods of particular configuration
    • D04B1/24—Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes specially adapted for knitting goods of particular configuration wearing apparel
    • D04B1/26—Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes specially adapted for knitting goods of particular configuration wearing apparel stockings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D7/00—Producing flat articles, e.g. films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D7/00—Producing flat articles, e.g. films or sheets
    • B29D7/01—Films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • 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
    • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
    • Y10T428/2457—Parallel ribs and/or grooves

Definitions

  • This invention relates to an article "of manufacture comprising a, synthetic plastic material having a special surface formed thereon; and a method of surfacing and re-sUrfacing synthetic plastic materials. More particularly, the invention relates to a pad of thermoplastic material consisting of a polymerized synthetic resin, and method of imparting a special surface to such material.
  • Figure 1 is a perspective View of a slab or pad of thermoplastic material having a, glossy surface as received from the manufacturer;
  • Figure 2 illustrates the method of imparting the hereinafter described special surface to the pad of Figure 1;
  • Figure 3 is a perspective view of the finished article of manufacture of the present invention.
  • the leg portion including the sides of the heel portion, are knitted on a legging machine, after which the foot is knitted on in a footing machine.
  • a legging machine Before the stocking is sent to the footing machine it is topped, which involves creasing the leg portion adjacent its unfinished end or, in other Words, opening a course of loops in order that they may be fitted over a row of pins for purposes not material to the present invention.
  • This creasing is performed manually by an operator who holds the unfinished end of the stocking leg in contact with a flexible, yielding pad of material and operates upon it with a pointed instrument called a creaser.
  • the most suitable material for the pad consists of a thermoplastic polymerized synthetic resin such as vinyl chloride, vinyl butyral, or polyethylene.
  • This material when received from the manufacturer, has a giossysurrace nevertireless is somewhat tacky and provides good friction characteristics for preventing the stock-'- ifi-g from slipping on the bad While it is being creased.
  • the surface of such material becomes scratched and roughened through wear and, since the scratches are parallel, the coefficient of friction of the material in the direction of the scratches is reduced, leading to slippage of the stocking leg on the pad which causes damage and loss. Accordingly, it has been found that after about three weeks of use the pads must be discarded even though very little of the material has been worn away. Since thesepads are used in considerable quantities, the necessity of discarding them after such a short period of use occasions considerable economic loss.
  • a creasing pad Ill for example a pad of thermoplastic polymerized vinyl chloride, having a flexible, yielding consistency
  • a layer ll of closely woven textile material such as broadcloth, percale, or the like
  • a heated fiatiron I2 for a few seconds until the surface of the thermoplastic material has softened and has received the impression of the adjacent surface of the textile material.
  • a temperature of from 350 F. to 450 F. is suitable for this purpose, depending upon the length of the treatment and the degree of pressure applied.
  • the cloth layer is peeled away from the thermoplastic material leaving a surface l3 which is a replica of the surface of the textile material.
  • This uniform, slightly roughened surface has been found to possess admirable friction characteristics for the stated purpose, and moreover, may be used for approximately twice the length of time as a pad of the original glossy material before it becomes unsuitable for use.
  • the material may be resurfaced by the described method an indefinite number of times, and thus may be used for a prolonged period before finally discarded.
  • the method of the present invention may be applied to any thermoplastic material which possesses suitable characteristics for the stated use, namely, suitable strength, flexibility, toughness and yielding properties.
  • suitable characteristics for the stated use namely, suitable strength, flexibility, toughness and yielding properties.
  • the degree of heat and pressure applied in carrying out the above described method may vary somewhat depending upon the material chosen but, with the materials heretofore employed, such variation will not exceed the range stated above.
  • the described method may be employed for surfacing or re-surfacing thermoplastic materials for any desired purpose, the invention not being limited to the production of creasing pads for hosiery manufacture.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Socks And Pantyhose (AREA)

Description

June 1, 1948.
R. w. FORNWALT 2,442,405
SYNTHETIC PLASTIC PAD Filed July 3, 1946 Patented June 1, 1948 UNITED STATES PATENT OFF! CE SYNTHETIC PLAs'Tio P'A-D Ralph W. Forneau, Lebanon, Pa. Application July s, 1946, Semi No. than 2 claims. (01. 66-1) This invention relates to an article "of manufacture comprising a, synthetic plastic material having a special surface formed thereon; and a method of surfacing and re-sUrfacing synthetic plastic materials. More particularly, the invention relates to a pad of thermoplastic material consisting of a polymerized synthetic resin, and method of imparting a special surface to such material.
It is a special object of the invention to provide a creasing pad of thermoplastic polymerized synthetic resin, which pad has a rather special application in manufacture of nylon stockings, and to provide a novel and effective method of imparting to such pad a surface which makes it especially adaptable to the stated purpose.
Other and further objects, features and advantages will be apparent from the description which follows, read in connection with the accompanying drawings in which Figure 1 is a perspective View of a slab or pad of thermoplastic material having a, glossy surface as received from the manufacturer;
Figure 2 illustrates the method of imparting the hereinafter described special surface to the pad of Figure 1; and
Figure 3 is a perspective view of the finished article of manufacture of the present invention.
In order to facilitate an understanding of the invention, reference is made to the embodiment thereof shown in the accompanying drawings, and detailed descriptive language is employed. It will nevertheless be understood that no limitation of the invention is thereby intended and that various changes and alterations are contemplated such as would ordinarily occur to one skilled in the art to which the invention relates.
In the manufacture of stockings, the leg portion, including the sides of the heel portion, are knitted on a legging machine, after which the foot is knitted on in a footing machine. Before the stocking is sent to the footing machine it is topped, which involves creasing the leg portion adjacent its unfinished end or, in other Words, opening a course of loops in order that they may be fitted over a row of pins for purposes not material to the present invention. This creasing is performed manually by an operator who holds the unfinished end of the stocking leg in contact with a flexible, yielding pad of material and operates upon it with a pointed instrument called a creaser.
In the case of nylon stockings it has been found that the most suitable material for the pad consists of a thermoplastic polymerized synthetic resin such as vinyl chloride, vinyl butyral, or polyethylene. This material, when received from the manufacturer, has a giossysurrace nevertireless is somewhat tacky and provides good friction characteristics for preventing the stock-'- ifi-g from slipping on the bad While it is being creased. However, after a few weeks of use the surface of such material becomes scratched and roughened through wear and, since the scratches are parallel, the coefficient of friction of the material in the direction of the scratches is reduced, leading to slippage of the stocking leg on the pad which causes damage and loss. Accordingly, it has been found that after about three weeks of use the pads must be discarded even though very little of the material has been worn away. Since thesepads are used in considerable quantities, the necessity of discarding them after such a short period of use occasions considerable economic loss.
It has been determined that by applying to the creasing pads made of the above-named materials, a special surf-ace as hereinafter described, the life of the pads may be doubled. Moreover, by the method of the present invention, when the pads become unusable they may be re-surfaced an indefinite number of times, thus vastly prolonging their period of usefulness and effecting a considerable saving to hosiery manufacturers.
According to the method of the present invention, a creasing pad Ill, for example a pad of thermoplastic polymerized vinyl chloride, having a flexible, yielding consistency, is covered with a layer ll of closely woven textile material such as broadcloth, percale, or the like, and is pressed with a heated fiatiron I2 for a few seconds until the surface of the thermoplastic material has softened and has received the impression of the adjacent surface of the textile material. A temperature of from 350 F. to 450 F. is suitable for this purpose, depending upon the length of the treatment and the degree of pressure applied. Preferably, only light pressure is applied and the material is heated to a temperature of approximately 400 F.
The heat and pressur are then removed, and
. the cloth layer is peeled away from the thermoplastic material leaving a surface l3 which is a replica of the surface of the textile material. This uniform, slightly roughened surface has been found to possess admirable friction characteristics for the stated purpose, and moreover, may be used for approximately twice the length of time as a pad of the original glossy material before it becomes unsuitable for use.
It is preferred to treat the original, glossy material before putting it into use as a creasing pad, but in either case the material may be resurfaced by the described method an indefinite number of times, and thus may be used for a prolonged period before finally discarded.
The method of the present invention may be applied to any thermoplastic material which possesses suitable characteristics for the stated use, namely, suitable strength, flexibility, toughness and yielding properties. The degree of heat and pressure applied in carrying out the above described method may vary somewhat depending upon the material chosen but, with the materials heretofore employed, such variation will not exceed the range stated above.
Moreover, the described method may be employed for surfacing or re-surfacing thermoplastic materials for any desired purpose, the invention not being limited to the production of creasing pads for hosiery manufacture.
Having thus described the invention, what is new and desired to be obtained by Letters Patent 1. As an article of manufacture, a. stocking REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 1,534,527 Joseph Apr. 21, 1925 1,753,865 LaMont Apr. 8, 1930 1,827,127 Weamer Oct. 13, 1931 1,986,629 Fenton Jan. 1, 1935 2,024,177 Mellor et a1 Dec. 17, 1935 2,341,019 Cook Feb. 8, 1944
US681401A 1946-07-03 1946-07-03 Synthetic plastic pad Expired - Lifetime US2442405A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2653111A (en) * 1949-10-31 1953-09-22 Albert L Murray Method of making shoe soles
US2663911A (en) * 1951-06-27 1953-12-29 Gen Motors Corp Method of decorating plastics
US2782140A (en) * 1953-09-04 1957-02-19 Goodyear Tire & Rubber Method of thermally sealing rubber hydrochloride films
US2855338A (en) * 1955-10-21 1958-10-07 Troy F Mulkey Method of mending vinyl plastic upholstered seats
US3873666A (en) * 1970-08-14 1975-03-25 Nat Distillers Chem Corp Process for the preparation of transparencies for use in photoreproduction
US4439391A (en) * 1979-06-26 1984-03-27 International Paper Company Polymeric sheets

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1534527A (en) * 1921-04-16 1925-04-21 Tucker Rubber Corp Rubber fabrication
US1753865A (en) * 1928-06-25 1930-04-08 Mont Charles T La Stocking marker
US1827127A (en) * 1929-12-27 1931-10-13 Lee Rubber & Tire Corp Method of ornamenting rubber mats
US1986629A (en) * 1934-04-20 1935-01-01 Goodrich Co B F Method of making contoured rubber articles
US2024177A (en) * 1932-08-23 1935-12-17 Celanese Corp Treatment of textile materials
US2341019A (en) * 1941-05-13 1944-02-08 Norman W Cook Method of anchoring the elastic threads of fabric and the product produced by the method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1534527A (en) * 1921-04-16 1925-04-21 Tucker Rubber Corp Rubber fabrication
US1753865A (en) * 1928-06-25 1930-04-08 Mont Charles T La Stocking marker
US1827127A (en) * 1929-12-27 1931-10-13 Lee Rubber & Tire Corp Method of ornamenting rubber mats
US2024177A (en) * 1932-08-23 1935-12-17 Celanese Corp Treatment of textile materials
US1986629A (en) * 1934-04-20 1935-01-01 Goodrich Co B F Method of making contoured rubber articles
US2341019A (en) * 1941-05-13 1944-02-08 Norman W Cook Method of anchoring the elastic threads of fabric and the product produced by the method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2653111A (en) * 1949-10-31 1953-09-22 Albert L Murray Method of making shoe soles
US2663911A (en) * 1951-06-27 1953-12-29 Gen Motors Corp Method of decorating plastics
US2782140A (en) * 1953-09-04 1957-02-19 Goodyear Tire & Rubber Method of thermally sealing rubber hydrochloride films
US2855338A (en) * 1955-10-21 1958-10-07 Troy F Mulkey Method of mending vinyl plastic upholstered seats
US3873666A (en) * 1970-08-14 1975-03-25 Nat Distillers Chem Corp Process for the preparation of transparencies for use in photoreproduction
US4439391A (en) * 1979-06-26 1984-03-27 International Paper Company Polymeric sheets

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