GB2121941A - Drying glue applied to book block backs - Google Patents

Drying glue applied to book block backs Download PDF

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Publication number
GB2121941A
GB2121941A GB08314558A GB8314558A GB2121941A GB 2121941 A GB2121941 A GB 2121941A GB 08314558 A GB08314558 A GB 08314558A GB 8314558 A GB8314558 A GB 8314558A GB 2121941 A GB2121941 A GB 2121941A
Authority
GB
United Kingdom
Prior art keywords
belt
electrodes
articles
book block
drying
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.)
Granted
Application number
GB08314558A
Other versions
GB2121941B (en
GB8314558D0 (en
Inventor
Siegfried Hafer
Manfred Riesmeier
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.)
RAHDENER MASCHF AUGUST
Rahdener Maschinenfabrik August Kolbus GmbH and Co KG
Original Assignee
RAHDENER MASCHF AUGUST
Rahdener Maschinenfabrik August Kolbus GmbH and Co KG
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 RAHDENER MASCHF AUGUST, Rahdener Maschinenfabrik August Kolbus GmbH and Co KG filed Critical RAHDENER MASCHF AUGUST
Publication of GB8314558D0 publication Critical patent/GB8314558D0/en
Publication of GB2121941A publication Critical patent/GB2121941A/en
Application granted granted Critical
Publication of GB2121941B publication Critical patent/GB2121941B/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42C—BOOKBINDING
    • B42C13/00—Bookbinding presses; Joint-creasing equipment for bookbinding; Drying or setting devices for books
    • B42C13/006—Drying or setting devices for books
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/32—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action
    • F26B3/34—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects
    • F26B3/347—Electromagnetic heating, e.g. induction heating or heating using microwave energy

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Biotechnology (AREA)
  • Molecular Biology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

A conveyor unit which passes the glued book blocks through an electric field established by HF electrodes which are arranged transversely to the conveyor unit and over which the book blocks are passed. The HF electrodes (2) are arranged in such a way as to be inclined in the transport direction, and there is provided between the book block backs (1) and the HF electrodes a continuous PTFE belt (3) which runs synchronously with the book block transport system and on which the book blocks rest with their backs. The HF electrodes bear resiliently against the underside of the belt. <IMAGE>

Description

SPECIFICATION Method and apparatus for drying and hardening by means of a high-frequency alternating electric field an adhesive applied to book block backs or the like The invention relates to a device for drying and hardening by means of a high-frequency (HF) voltage field the glue applied to book block backs or the like, in particular for hardening and drying the glue in adhesively backed book blocks. One known type of apparatus comprises a conveyor unit which holds the book blocks in pincers of a transport system, with HF electrodes which are arranged transversely to the conveyor unit and over which the book blocks are passed and with a transport belt which is installed between the HF electrodes and the book block backs and on which the book block backs are laid.
German Offenlegungsschrift 2,426,704 describes such a high-frequency drying unit for drying and hardening the glue in an adhesive binding installation.
Because of the gap between the HF electrodes and the book block backs or the transport belt, the HF voltage chosen has to be relatively high, with the result that flashover arcs are unavoidable.
Such arcs are known to destroy the glue film and the binding material, and another consequence is major damage to the mechanical equipment.
It is an object of the invention to provide a drying and hardening device of the generic type mentioned in the introduction with which improved drying results can be obtained within a very short period without the quality of the product being impaired.
The present invention provides in one aspect apparatus for drying and hardening an adhesive applied to articles, using a high-frequency alternating electric field, said apparatus comprising a belt made from a fluorocarbon polymer, a plurality of high-frequency electrodes bearing resiliently against one side of the belt to establish said field and means for effecting relative movement between the electrodes in contact with one side of the belt and said articles while the latter are in contact with the opposite side of the belt.
The electrodes are arranged in such a way as to be inclined in the transport direction.
The fluorocarbon polymer is preferably polytetrafluoroethylene (PTFE) suitably that sold under the registered Trade Mark TEFLON.
In another aspect the invention provides a method of hardening an adhesive applied to articles, wherein said articles are placed in contact with one side of a belt made from a fluorocarbon polymer and the belt and the articles together are caused to pass through a high-frequency alternating electric field established by means of a plurality of high frequency electrodes bearing resiliently against the opposite side of the belt.
In a preferred system, the belt is a continuous belt which runs synchronously with a book block transport system and on which the book blocks rest with their backs, the HF electrodes bearing resiliently against the underside of the belt under the action of a spring.
The resilient fit of the inclined HF electrodes against the fluorocarbon belt or the book block backs prevents any formation of air gaps. As a result, the HF drying unit can be operated at a relatively low HF voltage, and the formation of arcs and hence the burning of the glue and of the binding materials is thereby prevented.
In an advantageous embodiment, each electrode is designed as a bridge with thin steel spring wires as supports, thereby reducing the idle power and increasing the efficiency of the installation.
In a further feature the electrodes are flattened at the end which bears against the fluorocarbon belt, the result of which feature being a significantly improved energy flux.
Below, an illustrative embodiment of the invention is described by means of the two diagrammatic drawings: The device for drying and hardening the glue applied to book block backs which is depicted in Figure 1 in a side view is intended for an adhesive binding installation, which is known to consist of a large number of book block pincers moving on a continuously circulating belt. In the device, book block 1 is held with its back facing downwards in a pair of pincers (not shown) and is passed conversely to the transport direction over HF electrodes 2 arranged at equal distances from one another. Between the book block back and the HF electrodes there is a continuous PTFE belt 3 which runs synchronously with the transport pincers and on which the book block backs rest.This belt has the function of holding the freshly applied adhesive backing material or the covers against the book block backs.
In accordance with the invention the HF electrodes are arranged in such a way as to be inclined in the transport direction, and they press, under the action of a spring, against the PTFE belt and thus against the book block backs.
The HF electrodes are provided with flattened ends 2a to improve the energy flux.
As a result of the exact fit of the HF electrodes against the PTFE belt, the formation of air gaps can be prevented, even in the case of irregularities in the throughput which are due to the book blocks differing in size, so that no flashovers can arise.
As Figure 2 makes clear, the electrodes are preferably designed in the form of a bridge where the electrode bodies are supported by two thin steel spring wires 4. As a result there is less idle power, the losses can be kept low and, ultimately, the efficiency of the installation can thus be increased.
1. Apparatus for drying and hardening an adhesive applied to articles, using a highfrequency alternating electric field, said apparatus comprising a belt made from a fluorocarbon
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (12)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Method and apparatus for drying and hardening by means of a high-frequency alternating electric field an adhesive applied to book block backs or the like The invention relates to a device for drying and hardening by means of a high-frequency (HF) voltage field the glue applied to book block backs or the like, in particular for hardening and drying the glue in adhesively backed book blocks. One known type of apparatus comprises a conveyor unit which holds the book blocks in pincers of a transport system, with HF electrodes which are arranged transversely to the conveyor unit and over which the book blocks are passed and with a transport belt which is installed between the HF electrodes and the book block backs and on which the book block backs are laid. German Offenlegungsschrift 2,426,704 describes such a high-frequency drying unit for drying and hardening the glue in an adhesive binding installation. Because of the gap between the HF electrodes and the book block backs or the transport belt, the HF voltage chosen has to be relatively high, with the result that flashover arcs are unavoidable. Such arcs are known to destroy the glue film and the binding material, and another consequence is major damage to the mechanical equipment. It is an object of the invention to provide a drying and hardening device of the generic type mentioned in the introduction with which improved drying results can be obtained within a very short period without the quality of the product being impaired. The present invention provides in one aspect apparatus for drying and hardening an adhesive applied to articles, using a high-frequency alternating electric field, said apparatus comprising a belt made from a fluorocarbon polymer, a plurality of high-frequency electrodes bearing resiliently against one side of the belt to establish said field and means for effecting relative movement between the electrodes in contact with one side of the belt and said articles while the latter are in contact with the opposite side of the belt. The electrodes are arranged in such a way as to be inclined in the transport direction. The fluorocarbon polymer is preferably polytetrafluoroethylene (PTFE) suitably that sold under the registered Trade Mark TEFLON. In another aspect the invention provides a method of hardening an adhesive applied to articles, wherein said articles are placed in contact with one side of a belt made from a fluorocarbon polymer and the belt and the articles together are caused to pass through a high-frequency alternating electric field established by means of a plurality of high frequency electrodes bearing resiliently against the opposite side of the belt. In a preferred system, the belt is a continuous belt which runs synchronously with a book block transport system and on which the book blocks rest with their backs, the HF electrodes bearing resiliently against the underside of the belt under the action of a spring. The resilient fit of the inclined HF electrodes against the fluorocarbon belt or the book block backs prevents any formation of air gaps. As a result, the HF drying unit can be operated at a relatively low HF voltage, and the formation of arcs and hence the burning of the glue and of the binding materials is thereby prevented. In an advantageous embodiment, each electrode is designed as a bridge with thin steel spring wires as supports, thereby reducing the idle power and increasing the efficiency of the installation. In a further feature the electrodes are flattened at the end which bears against the fluorocarbon belt, the result of which feature being a significantly improved energy flux. Below, an illustrative embodiment of the invention is described by means of the two diagrammatic drawings: The device for drying and hardening the glue applied to book block backs which is depicted in Figure 1 in a side view is intended for an adhesive binding installation, which is known to consist of a large number of book block pincers moving on a continuously circulating belt. In the device, book block 1 is held with its back facing downwards in a pair of pincers (not shown) and is passed conversely to the transport direction over HF electrodes 2 arranged at equal distances from one another. Between the book block back and the HF electrodes there is a continuous PTFE belt 3 which runs synchronously with the transport pincers and on which the book block backs rest.This belt has the function of holding the freshly applied adhesive backing material or the covers against the book block backs. In accordance with the invention the HF electrodes are arranged in such a way as to be inclined in the transport direction, and they press, under the action of a spring, against the PTFE belt and thus against the book block backs. The HF electrodes are provided with flattened ends 2a to improve the energy flux. As a result of the exact fit of the HF electrodes against the PTFE belt, the formation of air gaps can be prevented, even in the case of irregularities in the throughput which are due to the book blocks differing in size, so that no flashovers can arise. As Figure 2 makes clear, the electrodes are preferably designed in the form of a bridge where the electrode bodies are supported by two thin steel spring wires 4. As a result there is less idle power, the losses can be kept low and, ultimately, the efficiency of the installation can thus be increased. CLAIMS
1. Apparatus for drying and hardening an adhesive applied to articles, using a highfrequency alternating electric field, said apparatus comprising a belt made from a fluorocarbon polymer, a plurality of high-frequency electrodes bearing resiliently against one side of the belt to establish said field and means for effecting relative movement between the electrodes in contact with one side of the belt and said articles while the latter are in contact with the opposite side of the belt.
2. Apparatus according to Claim 1 wherein said fluorocarbon polymer is polytetrafluoroethylene.
3. Apparatus according to Claim 1 or Claim 2 wherein said belt is in the form of an endless conveyor belt on which said articles are transported, the high frequency electrodes bearing against the underside of the belt.
4. Apparatus according to Claim 3 wherein said electrodes are inclined towards the direction of travel of the belt.
5. Apparatus according to any preceding claim wherein each said electrodes is in the form of a bridge, the electrode body being supported in contact with the belt by a pair of resilient steel wires.
6. Apparatus according to any preceding claim wherein said electrodes have flattened portions in contact with the belt.
7. Apparatus for drying and hardening an adhesive applied to articles, substantially as herein described with reference to the accompanying drawings.
8. A method of hardening an adhesive applied to articles, wherein said articles are placed in contact with one side of a belt made from a fluorocarbon polymer and the belt and the articles together are caused to pass through a highfrequency alternating electric field established by means of a plurality of high frequency electrodes bearing resiliently against the opposite side of the belt.
9. A method according to Claim 8 wherein said articles are adhesively backed book blocks, and are arranged with their backs in contact with said belt.
10. A method according to Claim 8 or Claim 9 wherein said fluorocarbon polymer is polytetrafluoroethylene.
11. A method according to any one of Claims 8 to 10 wherein said belt is in the form of a conveyor belt with said electrodes bearing resiliently against its underside, and wherein said articles are carried on the conveyor belt through the electric field established by said electrodes.
12. A method according to Claim 8 substantially as herein described with reference to the accompanying drawings.
GB08314558A 1982-06-04 1983-05-26 Drying glue applied to book block backs Expired GB2121941B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19823221060 DE3221060A1 (en) 1982-06-04 1982-06-04 DEVICE FOR DRYING AND SETTING UP THE BOOK BLOCK BACK OR THE LIKE APPLIED GLUE USING A HIGH FREQUENCY VOLTAGE FIELD

Publications (3)

Publication Number Publication Date
GB8314558D0 GB8314558D0 (en) 1983-06-29
GB2121941A true GB2121941A (en) 1984-01-04
GB2121941B GB2121941B (en) 1985-08-29

Family

ID=6165296

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08314558A Expired GB2121941B (en) 1982-06-04 1983-05-26 Drying glue applied to book block backs

Country Status (3)

Country Link
CH (1) CH662535A5 (en)
DE (1) DE3221060A1 (en)
GB (1) GB2121941B (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1592049A (en) * 1975-11-29 1981-07-01 Mohn Gmbh Reinhard Drying of glued bookbindings
GB1597687A (en) * 1977-04-27 1981-09-09 Nestle Sa Microwave freeze drying method and apparatus

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH372032A (en) * 1959-08-07 1963-09-30 Wuersch Walter Device for quick drying of the spines of books, catalogs, etc. with glue

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1592049A (en) * 1975-11-29 1981-07-01 Mohn Gmbh Reinhard Drying of glued bookbindings
GB1597687A (en) * 1977-04-27 1981-09-09 Nestle Sa Microwave freeze drying method and apparatus

Also Published As

Publication number Publication date
GB2121941B (en) 1985-08-29
GB8314558D0 (en) 1983-06-29
DE3221060A1 (en) 1983-12-08
CH662535A5 (en) 1987-10-15

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PCNP Patent ceased through non-payment of renewal fee