US3678595A - Method of drying articles being surface-coated - Google Patents

Method of drying articles being surface-coated Download PDF

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Publication number
US3678595A
US3678595A US70726A US3678595DA US3678595A US 3678595 A US3678595 A US 3678595A US 70726 A US70726 A US 70726A US 3678595D A US3678595D A US 3678595DA US 3678595 A US3678595 A US 3678595A
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United States
Prior art keywords
heating
periods
articles
film
time
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Expired - Lifetime
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US70726A
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English (en)
Inventor
Kurt Gunnar Fagerstrom
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Electrolux AB
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Electrolux AB
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Publication date
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    • F26B21/30—
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B15/00—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form
    • F26B15/10—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions
    • F26B15/12—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined
    • F26B15/18—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined the objects or batches of materials being carried by endless belts

Definitions

  • the present invention relates to a method of heat treating articles, particularly wooden products, after or in connection with surface treating or coating with paint, lacquer, putty or the like.
  • a surface coating, film, of paint, lacquer, putty or the like is applied on the article in question which is then subjected to heat treatment for curing and drying of the film applied.
  • heat treatment for curing and drying of the film applied.
  • it is considered necessary to heat the articles to temperatures between 40 and 100C during a relatively long time, which may amount to half an hour or an hour. Temperature and time are chosen with respect to the articles treated.
  • the object of the present invention is on the one a to reduce the said difficulties in attaining a good result and on the other hand to eliminate the drawbacks of the high production cost.
  • This is achieved by applying the invention which is characterized in that the articles are repeatedly subjected to periods of surface-heating within the temperature zone of 100-300 C. Between successive heating periods the articles are maintained in an atmosphere below 50C.
  • the surface heating periods are relatively short and between and seconds long to promote heating of the film in its entirety without raising the temperature of the base material to an detrimental value.
  • a plant for carrying out the method is essentially characterized by a conveyor system for the articles which passes through one or several heating zones separated from each other and with temperatures between 100 and 300C.
  • FIG. i is a side view of a surface-treating plant
  • FIG. 2 is a top plan view of the plant shown in FIG. H.
  • FIG. 3 is a fragmentary view illustrating section III of FIG. 1 on an enlarged scale.
  • a conveyor 10 which can be made in a manner well known and preferably is provided with speed control. Due to its comparatively great length, the conveyor comprises suitably a number of parts connected with each other.
  • the articles to be treated are introduced into the plant from the left in the Figures and are brought to an oven 11 in which they are preheated. Thereafter, the articles pass into a spraying chamber 12 in which a surface coating of paint, lacquer, putty or the like is applied.
  • the surface coating can be applied in any well known manner by curtain-coating, spraying, dipping and spreading, for example. Thereafter the articles pass into an oven 13 with low heat in which air is vented and the applied coating is set.
  • a drying oven 14 which also operates at a low temperature, for instance below 60C. Such an oven may often be dispensed with.
  • the drying oven 14 is followed by a number of high temperature ovens l5, l6, l7, l8, 19. In these ovens, a temperature between and 300C is maintained, preferably about l50-225C.
  • Each oven has such a short length in the direction of the conveyor that the stay of the articles in each oven will be short and preferably between 5 and 15 sec. depending on the speed of the conveyor belt. In some cases also a shorter or a somewhat longer time may preferably be used. Thus, the initial heating period can be longer than subsequent heating periods.
  • the articles between two subsequent treatments will for some time be in an atmosphere below 50C which can be a temperature near that of the ambient air.
  • a vent hood with a suction fan can be arranged over that part of the plant which comprises the oven H549. Likewise, some air can be blown between the heating ovens in order to reduce the length of the stabilizing paths.
  • the distance between the two high temperature ovens l5 and 16 is less than the distance for instance between the two last high temperature ovens 18, 19 in the row.
  • These distances are adapted in a suitable manner on the one hand in order to achieve the desired result of the treatment and on the other hand to limit the length of the plant as much as possible, in order to save costs for the space required and for equipment, as well as in order to thereby reduce the total transit time and increase the production per unit of time.
  • FIG. 1 and 2 the distance between the two high temperature ovens l5 and 16 is less than the distance for instance between the two last high temperature ovens 18, 19 in the row.
  • the ovens 15, i6, and H7 can be provided with rollers 22 so that each oven without difficulty can be moved on the base 23 in the direction of the conveyor 10 and to a suitable position with the purpose of obtaining intervals suitable with respect to the articles to be treated, to the kind of surface coating applied on the articles and to the temperature at which the plant is to operate. It is desirable for the interval of time between successive heating periods to be of such length that the temperature of all parts of the film will be equalized. FUrther, the interval of time between successive surface heating periods can be adjusted so that it increases and becomes longer with repeated periods of surface heating of the articles. Also the speed of the conveyor affects the location of the ovens.
  • a method of heat treating wooden articles substantially at the time a film of material is applied to surfaces thereof which is selected from a group consisting of paint, lacquer and putty
  • the improvement which comprises the steps of repeatedly subjecting the wooden articles to periods of surface heating at temperatures between 100 to 300C. and, between successive surface heating periods, maintaining the wooden articles in an atmosphere which is below 50C. for a period of time necessary to maintain the temperature of the wood below a predetermined temperature, the surface heating periods being relatively short and between 5 and 15 seconds long to promote heating of the film in its entirety without heating the wood to an elevated temperature which is detrimental.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
US70726A 1969-09-09 1970-09-09 Method of drying articles being surface-coated Expired - Lifetime US3678595A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE6912385A SE370356B (de) 1969-09-09 1969-09-09

Publications (1)

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US3678595A true US3678595A (en) 1972-07-25

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US70726A Expired - Lifetime US3678595A (en) 1969-09-09 1970-09-09 Method of drying articles being surface-coated

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US (1) US3678595A (de)
SE (1) SE370356B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4701355A (en) * 1984-03-29 1987-10-20 Timber Textures (Uk) Limited Method of artificially ageing wood
US6718653B1 (en) * 1999-10-29 2004-04-13 Aracruz Celulose S.A. Method for preventing or controlling the occurrence of stains on wood
US11229925B2 (en) 2020-03-12 2022-01-25 Ayotte Techno-Gaz Inc. System and process for curing a wet coating applied to a substrate

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2758386A (en) * 1951-09-05 1956-08-14 Moore Dry Kiln Co Drier method for veneer
US3364062A (en) * 1965-12-27 1968-01-16 Rayonier Inc Emulsion coating of cellulosic films
US3405020A (en) * 1963-12-26 1968-10-08 Sealed Air Corp Method and apparatus for the manufacture of plastic laminates and cellular materials

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2758386A (en) * 1951-09-05 1956-08-14 Moore Dry Kiln Co Drier method for veneer
US3405020A (en) * 1963-12-26 1968-10-08 Sealed Air Corp Method and apparatus for the manufacture of plastic laminates and cellular materials
US3364062A (en) * 1965-12-27 1968-01-16 Rayonier Inc Emulsion coating of cellulosic films

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4701355A (en) * 1984-03-29 1987-10-20 Timber Textures (Uk) Limited Method of artificially ageing wood
US6718653B1 (en) * 1999-10-29 2004-04-13 Aracruz Celulose S.A. Method for preventing or controlling the occurrence of stains on wood
US11229925B2 (en) 2020-03-12 2022-01-25 Ayotte Techno-Gaz Inc. System and process for curing a wet coating applied to a substrate

Also Published As

Publication number Publication date
SE370356B (de) 1974-10-14

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