GB2094710A - Apparatus for heat-laminating a sheet - Google Patents

Apparatus for heat-laminating a sheet Download PDF

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Publication number
GB2094710A
GB2094710A GB8201863A GB8201863A GB2094710A GB 2094710 A GB2094710 A GB 2094710A GB 8201863 A GB8201863 A GB 8201863A GB 8201863 A GB8201863 A GB 8201863A GB 2094710 A GB2094710 A GB 2094710A
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GB
United Kingdom
Prior art keywords
heat
sheet
roller
rollers
lamp
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB8201863A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ushio Denki KK
Meiko Shokai Co Ltd
Original Assignee
Ushio Denki KK
Meiko Shokai Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ushio Denki KK, Meiko Shokai Co Ltd filed Critical Ushio Denki KK
Publication of GB2094710A publication Critical patent/GB2094710A/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/142—Laminating of sheets, panels or inserts, e.g. stiffeners, by wrapping in at least one outer layer, or inserting into a preformed pocket
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/24—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools characterised by the means for heating the tool
    • B29C65/245—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools characterised by the means for heating the tool the heat transfer being achieved contactless, e.g. by radiation
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/45—Joining of substantially the whole surface of the articles
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411—Roller, cylinder or drum types
    • B29C66/83413—Roller, cylinder or drum types cooperating rollers, cylinders or drums
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/87—Auxiliary operations or devices
    • B29C66/872—Starting or stopping procedures
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/87—Auxiliary operations or devices
    • B29C66/874—Safety measures or devices
    • B29C66/8744—Preventing overheating of the parts to be joined, e.g. if the machine stops or slows down
    • B29C66/87445—Preventing overheating of the parts to be joined, e.g. if the machine stops or slows down by introducing protection shields
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91421—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the joining tools
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91431—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature the temperature being kept constant over time
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/0033—Heating devices using lamps
    • H05B3/0038—Heating devices using lamps for industrial applications
    • H05B3/0057—Heating devices using lamps for industrial applications for plastic handling and treatment
    • 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
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0822—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using IR radiation
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2017/00—Carriers for sound or information
    • B29L2017/001—Carriers of records containing fine grooves or impressions, e.g. disc records for needle playback, cylinder records
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2425/00—Cards, e.g. identity cards, credit cards
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2519/00—Labels, badges

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)

Abstract

Apparatus for laminating at least one surface of a sheet (2) such as an identification card, with a plastics film (3) includes a pair of conveying and pressing rollers (1A, 1B) a heat irradiation lamp (7A, 7B) arranged to face the outer circumference of at least one of the rollers so as to heat that circumference, and a concave mirror (6A, 6B) surrounding the respective lamp and roller except for the region (S) of the roller which abuts upon the other roller. Since the heat from each lamp is effectively reflected by the mirror, the lamination can be started within a short time after the lamp has been lit and the outside maintained stably at a constant temperature. Movable heat regulating means (61A, 61B) may be provided between each lamp and roller and electric heaters (9A, 9B) may be provided within the roller for use after initial warm-up of the roller surface. <IMAGE>

Description

SPECIFICATION Apparatus for heat-laminating a sheet The present invention relates to an apparatus for closely covering the surface of a sheet, such as a card or a label, with a thermoplastics film by passage between a pair of rollers at least one of which is heated.
With a sheet of the type such as a name card, an identification card, a season ticket, a miniature calendar or other card or label, it is convenient or necessary to form a surface covering thereby to impart durable and water-proof properties to that sheet, to improve it or to prevent the markings on the sheet from being altered. It is therefore known to heat-laminate plastics film to the sheet.
For this purpose, a variety of sheet surface covering apparatus have been proposed according to the prior art.
Figure 1 of the drawings shows the essential portions of one example of sheet surface covering apparatus according to the prior art. This apparatus can be used for covering both the sheet surfaces; it includes a pair of hollow pinch rollers 1A and 1 B arranged to form a nip on each side of the path P of travel of a sheet along which a sheet 2, interposed into or sandwiched between a folded covering plastics film 3, is conveyed, the two rollers forming a pinch means 4, and heaters 5A and 5B arranged in the respective internal spaces 1 1A and 11 B of the aforementioned rollers 1A and 1 B.A sheet 2, which is interposed into or sandwiched at its both surfaces between a folded-shaped plastic film 3 for coverage, is so conveyed along the path P as to pass through a region S at which the aforementioned rollers 1A and 1 B abut upon each other, so that the aforementioned plastic film 3 is welded to both the surfaces of the aforementioned sheet 2 by the heat from the aforementioned rollers 1A and 1 B. Incidentally, an apparatus for covering one sheet surface may have one of its heaters 5A and 5B omitted, as the case may be.
The aforementioned covering plastic film 3 is prepared, as shown in Figure 2 by way of example, by applying an adhesive layer AL made of a thermoplastic resin such as polyethyrene to one side of a surface layer CL made of a polyester film or the like thereby to form one film member and by sealing the two film members thus formed at their one-side edges E such that their adhesive layers AL internally face each other.
Nevertheless, in order that the apparatus of the above type may uniformly press and heat the sheet 2 to be treated, the rollers 1A and 1 B under consideration are made so thick as to have a large heat capacity. As a result, in case the apparatus under consideration is to be operated with its respective rollers being left in their cold state after a relatively long interruption of its operation such as its night interruption, it take a long time from the instant, when the aforementioned heaters 5A and 5B are started by turning on a main power switch (not shown), to the instant when the temperatures at their respective outercircumferenes of the rollers 1A and 1B reach such a level as is sufficient for achieving the desired heating of the film.Therefore, the apparatus of the prior art has a disadvantage that it has a long warm-up time.
It is, therefore, a main object of the present invention to provide a sheet surface covering apparatus which has a short warm-up time while being freed from the disadvantage described in the above according to the prior art.
According to a feature of the present invention, therefore, there is provided a sheet surface covering apparatus comprising: a pair of rollers constructing a pinch rollerforconveying a sheet which has at least one surface overlaid by a plastic film; a heat irradiation lamp arranged to face the outer circumference of at least such one of said paired rollers as abuts when in use upon said plastic film; and a reflecting mirror disposed to cover through a gap that outer circumference region of the roller facing said heat irradiation lamp, which excepts the abutting region where said roller abuts upon the other roller.
According to a preferred feature of the present invention, the apparatus further comprises radiant heat regulating means disposed to move into and out of the passage of said radiant heat so as to regulate the radiant heat from said heat irradiation lamp thereby to control the temperature at the outer circumference of said roller facing said heat irradiation lamp. The radiant heat regulating means according to a preferred mode includes a pair of radiant heat regulating members which are disposed to move toward and away from each other and an aperture is formed therebetween.
In the accompanying drawings: Figure 1 is a diagrammatic vertical section of one example of a laminating apparatus according to the prior art; Figure 2 is a cross-section of a covering plastic film; Figure 3 is a vertical section of a first embodiment of the present invention; Figure 4 is a vertical section of a second embodiment of the present invention; and Figure 5 is a circuit diagram of one example of a current supply circuit which can be used in the present invention.
The first and second embodiments of the present invention will now be described with reference to Figures 3 and 4 for the case of covering both surfaces of a sheet.
In the first embodiment shown in Figures 3, the pinch roller 4 is constructed of the paired rollers 1A and 1B abutting upon each other at the sheet path P, and concave reflecting mirrors 6A and 6B, which are respectively placed to face the path P, are so disposed as to cover the regions of the outer circumferences of the respective rollers 1 A and 1 B except for the including the abutting region S of the rollers 1A and 1 B. Within those reflecting mirrors 6A and 6B, there are arranged heat irradiation lamps 7A and 7B, such as halogen lamps or infrared ray lamps such that they face the outer circumferences of the aforementioned respective rollers 1A and 1 B. The heat irradiation lamps 7A and 7B thus arranged are connected in a common current supply circuit into which there is incorporated an "ON-OFF" control circuit, for example.On the outer sides of the aforementioned reflecting mirrors 6A and 6B, there are mounted heat insulator layers 8A and 8B which are made, e.g. of glass wool, asbestos, rock wool, or the like. As a result, the outer circumferences of the respective rollers 1A and 1 B are heated by the radiant heats which are emitted from the heat irradiation lamps 7A and 7B. If, at this state, the sheet 2 interposed into the plastic film 3 is forced into the pinch means 4, it is heated by the respective rollers 1A and 1 B, whiie being clamped and conveyed by the heated pinch roller 4, so that the plastic film 3 is press-welded to both the surfaces of the sheet 2, thus achieving the surface coverages of the sheet 2.
In the construction thus far described, since the respective rollers 1A and 1 B constructing the pinch means 4 have their outer circumferences heated directly by the radiant heat and since the heat irradiation lamps 7A and 7B, which can be turned on to instantly emit their predetermined radiant heats, are used as the heat sources forthe respective rollers 1A and 1 B, the temperatures at the outer circumferences of the respective rollers 1A and 1 B can be raised to a level sufficient to reliably achieve the sheet surface covering operations within a remarkably short time period from the instant, when the main power switch is closed to start the operations of the heat irradiation lamps 7A and 7B, even after a relatively long interruption of the operations, i.e., even when the respective rollers 1A and 1 B are started at their cold states, whereby the warm-up time can be shortened.
Here, if the outer circumferences of the aforementioned respective rollers have their outer circumferences colored black or dark gray, the absorption efficiency of the radiant heat given is enhanced so that the warm-up time can be further shortened.
In the apparatus described, the reflecting mirrors 6A and 6B are usually made of aluminum plates.
In the second embodiment shown in Figure 4, radiant heat regulating means 61A and 61 B each having an aperture are interposed between the aforementioned heat irradiation lamps 7A and 7B and the associated rollers 1A and 1 B. Each heat regulating means includes a pair of members which can move toward and away from each other for controlling the opening width of the aperture formed therebetween. By the actions of those radiant heat regulating means 61A and 61 B, the emission of the radiant heats to be received by the aforementioned rollers 1A and 1 B is regulated so that the rollers 1A and 1 B may have their outer circumferences prevented, when they are used continuously for a long time, from over-heated.
In order to prevent this over-heat, moreover, electric heaters 9A and 9B may be built into the rollers 1A and 1 B, as is also seen in Figure 4. Then, the aforementioned heat irradiation lamps 7A and 7B are used only for the initial heating operations of the outer circumferences of the rollers 1A and 1 B, and they are turned off, after the outer circumfer ences have been heated to the desired temperature, so that the rollers 1 A and 1B may be heated by the heaters 9A and 9B. In an alternative, the heating lamps 7A and 7B and the heaters 9A and 9B may be energizedtogetherto heatthe rollers 1Aand 1B. By these methods the prevention of the outer circumferences of the rollers 1A and 1 B from being overheated is effectively achieved.
Although the foregoing description of the first and second embodiments is directed to the case in which the sheet 2 has both its surfaces covered with the plastic film 3, the present invention is not limited thereto. An apparatus for covering only one surface of the sheet 2 can be provided if a heat irradiation lamp is arranged at such a position as to face the outer circumference of one of the paired rollers 1A and 1 B of the pinch means 4.
As is understood from the foregoing description of the first and second embodiments, according to the present invention, since the outer circumferences of the rollers, from which the heat is transferred to the surface of the sheet, are heated by the radiant heat coming from the heat irradiation lamps, it is possible to provide a sheet surface covering apparatus which can raise the temperature of the outer circumferences of the rollers within a short time period so that it has a short standby time. Moreover, the heat loss is low because both the outer circumferences of the rollers excepting their abutting region and the heat irradiation lamps are enclosed by the reflecting mirrors so that the radiant heating operations may be efficiently achieved.In case it is necessary to prevent the outer circumferences of the rollers from being over-heated, furthermore, it is sufficient to add, if necessary, the heat regulating members which have the relatively simple construction. Thus, the sheet surface covering apparatus according to the present invention has a remarkably high practic al value.
In order to control the temperature of the rollers 1A and 1 B, it is simply sufficient to add the common switch circuit which is made operative to effect the ON-OFF control of the supply current to the aforementioned heat irradiation lamps 7A and 7B.
Nevertheless, as shown in Figure 5, for example, if there is incorporated into a current supply circuit 10 a phase control circuit 100 which is composed, in combination, of a positive type thermistor 101 having its resistance varied in accordance with the temperature at the outer circumference of either of the aforementioned rollers 1A and 1 B, atria 102 or a current control element with control electrodes, and a trigger diode 103, the control of the emission of the radiant heat can be achieved at the state in which the heat irradiation lamps 7A and 7B are lit at all times actually, and the emission of the radiant heat itself is varied gently and with a small variation. Therefore, the construction thus far described is preferable because the temperature of the rollers 1A and 1 B can be maintained remarkably stable at all times.
Incidentally, reference characters R1 and R3, and C1 and C2 indicate resistors and capacitors, respectively.

Claims (7)

1. Apparatus for heat-laminating a sheet com prising: a pair of rollers forming a nip for conveying a sheet which has at least one surface overlaid by a plastics film; a heat irradiation lamp arranged to face the outer circumference of at least such one of said paired rollers as abuts when in use upon said film; and a reflecting mirror disposed to enclose said lamp and the outer circumference region of the roller facing said lamp apart from the region where said roller abuts upon the other roller.
2. Apparatus as claimed in Claim 1, further comprising radiant heat regulating means disposed to be movable so as to regulate the radiant heat from said heat irradiation lamp thereby to control the temperature at the outer circumference of said roller facing said heat irradiation lamp.
3. Apparatus as claimed in Claim 2, wherein said heat regulating means includes a pair of radiant heat regulating members which are disposed to move toward each other and away from each other so as to leave an aperture therebetween.
4. Apparatus as claimed in Claim 1, 2 or 3, further comprising a heat insulator layer mounted on the outer side of said reflecting mirror.
5. Apparatus as claimed in any of Claims 1 to 4, further comprising an electric heater incorporated into at least such one of said paired rollers as in use abuts upon said plastics film.
6. Apparatus for heat-laminating a surface of a sheet, substantially as herein before described with reference to any of Figures 3 to 5 of the drawings.
7. A method of heat-laminating at least one surface of a sheet to a plastics film, wherein apparatus as claimed in any preceding claim is used.
GB8201863A 1981-02-06 1982-01-22 Apparatus for heat-laminating a sheet Withdrawn GB2094710A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1981014875U JPS57129622U (en) 1981-02-06 1981-02-06

Publications (1)

Publication Number Publication Date
GB2094710A true GB2094710A (en) 1982-09-22

Family

ID=11873183

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8201863A Withdrawn GB2094710A (en) 1981-02-06 1982-01-22 Apparatus for heat-laminating a sheet

Country Status (4)

Country Link
JP (1) JPS57129622U (en)
DE (1) DE3203351A1 (en)
FR (1) FR2499455A1 (en)
GB (1) GB2094710A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0538636A1 (en) * 1991-10-23 1993-04-28 Robert Bosch Gmbh Process and apparatus for welding packaging material

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS506177B1 (en) * 1970-09-16 1975-03-11
JPS56126124A (en) * 1980-03-10 1981-10-02 Meiko Shokai:Kk Laminating device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0538636A1 (en) * 1991-10-23 1993-04-28 Robert Bosch Gmbh Process and apparatus for welding packaging material

Also Published As

Publication number Publication date
JPS57129622U (en) 1982-08-12
FR2499455A1 (en) 1982-08-13
DE3203351A1 (en) 1982-08-12

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