JPS5998761A - Coating method by roll transfer of expandable hot-melt and apparatus therefor - Google Patents

Abstract

PURPOSE:To perform easily openable bookbinding, by ejecting the suitable amount of expandable hot-melt onto the surface of a transfer roll, temporarily mounting it on the surface of said transfer roll, and then transferring and applying it by rotation. CONSTITUTION:Using expandable hot-melt as an adhesive agent, the molten expandable hot-melt is ejected onto the upper surface of a transfer roll 24 in a suitable amount corresponding to the length of the back B1b of the contents B1 of a book and then transferred onto the back B1b while inhibiting the temp. falling of said molten expandable hot-melt. Hence, the book easy to open or close is economically obtained, since said expandable hot-melt has elasticity.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for applying a foamed hot melt adhesive to the back of a book during bookbinding by roll transfer.

Conventionally, hot melt adhesives have often been used as adhesives for attaching covers to the backs of books.

In order to attach these items, hot melt was applied to the back and then a cover was attached to the armpit. A side view of an example of these devices is shown in FIG. Pellet-shaped pot melt H type is put into the hot melt melting ink 11 and heated and melted by a heater 12 provided at the bottom of the tank. The lower part of the transfer roll 4 is immersed near the liquid surface of the molten hot melt HMo', and a part of the molten hot melt i adheres to the surface of the transfer roll and rotates up (HMo'). At the top position, the molten hot melt HMo adhering to the surface of the transfer roll is brought close to the back Bb of the book content B moving in the horizontal direction 'A', and the molten hot melt is is transferred (HM) onto the above-mentioned back.

The content B of the shredded book is chucked one by one by the chuck plate 1.2, and the chuck plate moves endlessly and continuously by the chuck (not enough drawings), so the back Bb of the book content B is Continuously approaches the transfer roll 4 and the molten Botmelt is adhered (HM). Immediately after that, the thickness is adjusted to the required thickness by the doctor roll 6, and after the appropriate amount of the molten hot melt is applied, a fler 71-conveyor held 1 is applied from below the moving chuck plate.
6 comes along with its feet, merges with the back surface of the chucked book, and runs in the same direction and at the same speed. A cover sheet C' is placed on the flat belt conveyor in advance at a proper position, and at the above-mentioned merging position, the cover sheet C'
The back of the book B'' is pressed (Pl) by the pressure plate 15 located below the flat belt conveyor 16, and is adhered via hot melt HM''.

The above is the conventional method of adhering the cover to the back of the book's contents using hot melt.

However, recently, foamed honotomel 1 has been used instead of hot melt as an adhesive for attaching the cover in the bookbinding process.
- has been attracting attention.

Originally, foamed hot melt adhesives are unvulcanized rubber-based, saturated polyester-based, polyamide-based, polyolefin-based, polyolefin-based copolymers, or modified products thereof. air or N2.
This is a product in which gas such as CO2 is mixed in as countless closed bubbles, and the volume thereof is inevitably expanded to about 1.5 to 5 times. In addition, these characteristics include not only maintaining the original adhesiveness, but also reducing the amount of raw material adhesive due to a decrease in specific gravity, decreasing the apparent viscosity under high pressure in the applicator, and reducing the amount of adhesive used after dispensing. Decrease in fluidity (thixotrophic property), thinning of the adhesive layer by pressure bonding and expansion of its bonding area, shortening of cera I time, improvement of adhesion to porous and rough surfaces, and Expansion of low-temperature applications due to rapid cooling of the surface, increased elasticity, improved sealing performance, extended open time during the process, reduced overall costs, etc.
It has many advantages.

Experiments have shown that foamed hot melt has the above-mentioned properties, and therefore exhibits various effects when used as an adhesive for the spine of book contents during the bookbinding process. It has become clear. In other words, the foamed hot melt permeates into the minute gaps between each paper sheet, the adhesive layer becomes thinner, and the fluidity after dispensing is low, so a so-called stringy phenomenon occurs when dispensing is interrupted. In addition to the work process, the book itself has elasticity after it has been bound, so it is difficult to handle the book. It turns out that it also has many advantages. A more specific list of these effects is as follows.

(1) For books bound using conventional hot melt, the hot melt solidifies into a plate shape, and when the book is opened,
The gutter of each sheet becomes difficult to open flat. When foaming type Fosotomel I is used, the spine of the book's contents, that is, the adhesive has elasticity, making it easier to open the gutter flat.

(2) In item (1) above, if the gutter hardened by the pot melt is forced flat by hand, the hot melt solidified into a plate shape on the spine of the book's contents will spread onto the opened sheet of paper. There may be rope-like cracks along the binding. The foam-type hot-melt ones are elastic, so they don't break, and when you close the book, they return to their original shape.

(6) As mentioned in items (1) and (2) above, when using foamed hot melt, the gutter of each sheet can be opened flat, so the printing space can be expanded accordingly.

(4) When you open a book that has been bound using the conventional pot-melt method with the paper grained in the opposite direction (side grain), the spine of the book's contents is hard, so the gutter area Horizontal wrinkles occur, but because of the elasticity of foamed Honmelt, it adapts to each paper sheet and does not cause horizontal wrinkles.

(5) The amount of adhesive used for the foamed Bottles/Melt is about 1 to 10 times that of the conventional hot melt, which greatly contributes to cost reduction and energy saving.

(6) When using foam hot melt, the open time is about 50% longer than conventional hot melt, but on the other hand, the set time for crimping etc. is shortened, which helps increase production speed. I will make a contribution.

The above are the new effects obtained when foamed hot melt is used as an adhesive in bookbinding, and this is the reason why the use of foamed hot melt in bookbinding has attracted attention.

An object of the present invention is to first discharge an appropriate amount of foamed hot melt corresponding to the length of the spine onto the transfer roll surface in the process of applying adhesive to the back of the book in bookbinding work, and It is an object of the present invention to provide a method and an apparatus for applying a mold hot melt to the entire surface of the back part by once placing a mold hot melt on a transfer roll surface and rotating the roll.

The method of the present invention will be explained with reference to the drawings.

Please refer to Figure 2. Book contents B are on chunk board 21
．． 22 and moves continuously on a straight line, as in the conventional case. It's a sword, roll T-roll 24 below.
It is also the same as the conventional method. However, the transfer roll is not provided with a conventional melting tank, but instead has a foaming hot melt I nozzle 35 and its discharger 6.
6. A foaming hot melt applicator 40, etc. is provided, and the nozzle is oriented in the rotational direction ttE'' of the transfer roll rotating in the same direction as the traveling direction 9A'' of the chuck plate, and the transfer roll is rotated as much as possible. Provided for the upper part. As a result, the foamed hot melt FM discharged from the nozzle is placed on the surface of the transfer roll 24 and rotates in the direction of travel of the eleven spines, approaching the spines B and b of the book. , the foamed Honmelt is completely transferred onto the back surface. The subsequent steps are similar to those used in conventional hot tart application to attach the cover.

Next, the apparatus according to the present invention will be explained. Referring also to FIG. 2, the structure will first be described. The chuck plates 21 and 22 are of the upright type as in the prior art, and are fitted with a chino (not shown in the drawings) and connected to a chino drive device. The transfer roll 24 is provided below the chuck plate as in the conventional case, but the hot melt melting tank has been removed, and in its place is a foaming hot melt discharger 66 and its nozzle 65. The above transfer roll 24
The discharge device 66 is oriented in the same direction as the rotational direction "E" of the discharge device 66 and is placed as close to the top of the surface as possible.
is connected to the foaming hot melt applicator 40 by a heat-resistant and pressure-resistant hose 69. The on-off valve in the discharger is operated by a pneumatic operating valve 67, and the valve is operated by operating air OA.
The pneumatic operation valve is operated by a solenoid valve 68, and is electrically connected to the electric position detector 41. After the above, that is, below the chuck plate, a flat belt conveyor 46 for feeding the cover and a pressure plate 49 for the lower part of the chuck plate of the flat belt conveyor are provided, as in the conventional case.

Next, the operation of the above device will be explained. Chuck plate 21
．． 22 chucks the back B, b of the book content B1 downward, and continuously moves to the horizontal direction value.
The transfer roll heated to 0°C to 200°C is close to the back of the book and is rotated by a drive device (not shown in the drawing) in the same direction 11Err as the horizontal direction 11A. Electric position detector 41 detects the position of the back of a moving book
The solenoid valve 68 is actuated via the amplifier 42, the on-off valve in the dispenser is opened via the electric operation valve 67, and the foamed hot melt applicator 40 is passed through the heat-resistant and pressure-resistant hose 69. The foamed hot melt that is pressure-fed is discharged from the nozzle 65. The discharged foamed hot melt FM is placed on the surface of the rotating transfer roll 24,
The same direction as the moving direction value on the back of the book above AE
When the transfer roll 24 is rotated to the point where the transfer roll 24 and the spine B, b are close to each other, all of the foamed hot melt l-FM is transferred onto the spine of the book (FM). As the book continues to move further, the end of the book's back reaches the electrical position detector 41.
When it passes the position, it sends a 'cut off' signal, closes the on-off valve in the dispenser and stops discharging the foamed Honmelt to the transfer roll.This causes the content of the book to disappear. The foamed Hora I melt is ejected onto the transfer roll surface in an amount equal to the length of the back of the roller, and is transferred and coated onto the back surface.
6 and by adjusting the foam hot melt applicator. In this way, the back B of the content B1 of the above book
, after completing the application to b, the contents of the next book are B. wait for the arrival of When the contents of the book are chucked by the chuck plate and overflow into the movement line of the chuck plate, the electric position detector 41 senses and sends a signal, as before, and turns on the on-off valve in the ejector. Open it, discharge the foamed hot melt onto the transfer roll surface, and repeat the same process. The process after the transfer application of foamed hot melt to the back of the book's contents is almost the same as that in conventional hot melt roll transfer. That is, from below the foam hot tart FM' applied to the back of the book, the cover 01' placed on the flat belt conveyor 46 joins the cover 01' at the same speed as the book content B1'. The flat belt conveyor is pressurized by a downward pressure plate 49, and the cover C1 is made of foamed hot melt FM.

It is glued to the back surface of the book content B1 via the.

The above method and apparatus according to the present invention have been described in the case where the rotational direction tllll of the transfer roll 24 is the same as the movement direction ``A'' of the back of the book. , when the transfer amount is relatively small (thickness 0.05~
0.8mm). However, if more is required, it is more effective to rotate the transfer roll in the opposite direction vXF as shown in FIG. However, in this case, experimentally, there was some transfer loss of the foamed hot melt on the surface of the transfer roller 24a, and during continuous operation, there was a slight unevenness in the amount of application to the back of each book. may occur. In addition, when the above-mentioned transfer loss occurs, as shown in the same figure, the scraper 26a
It is necessary to scrape it off.

As described above, according to the method and apparatus for applying foamed hot melt by transfer according to the present invention, a conventional transfer roll is used, the hot melt melting tank is removed, and foamed hot melt is applied by transfer. By providing a fabric device, it is possible to apply adhesive to the back of the book using foam-type Honmelt, which not only greatly reduces the amount of adhesive used, but also reduces the amount of adhesive used at the gutter of the book when the book is opened. Many other bookbinding benefits such as increased flexibility can be obtained.

[Brief explanation of drawings]

Fig. 1 is a side view of a conventional hot melt roll transfer type cover pasting device used in bookbinding work. Fig. 2 is a side view of a foamed hot melt roll transfer type cover pasting device according to the present invention. Fig. 6 is a side view of the same device as above. Side view of the armpit when the transfer roll is reversed Explanation of main symbols C2, 21, 22... Chuck plate 4, 24...
Transfer roller 6...Doctor roll 7...
Doctor 11...Hot melt melting tank 13.
46...Flat belt conveyor 15°49...
・Pressure plate 35... Nozzle 36... Discharge device
40... Foaming hot melt applicator 41...
・Electrical position detector B. +B, B', B〃. BII'; B1+ Bl + J"+ B1"'
; B2...Contents of the book Bb. B, b, B2b...back of book contents C',
CLJ, CIII; C1', C, /7, (
:,,111...Cover FM, FM,', FM,''
;FM2...foaming hot melt HMo, HM
o'. HMo'', HM, HM', HM'', Hot melt patent applicant Nordson Corporation (and one other person) Procedural amendment (method) June 22, 1981 1, Indication of case 1988 Patent Application No. No. 207419 No. 2, Title of the invention Coating method and device for foamed hot melt by roll transfer, and relationship with the case of the person making the amendment Patent applicant address: 4-I 0-74 Minamiinui, Honbunagawa-ku, Tokyo 140
Subject of amendment (1) “Description” (2) “Drawings” 5. Contents of amendment as per attached sheet. There are no changes to the engravings of the specifications and drawings. (1) Submit one printable statement as shown in the attached sheet. (2) We will submit one official drawing as shown in the attached sheet.

Claims (1)

[Scope of Claims] 1) In the step of applying adhesive to the back of the contents of the book in bookbinding work, the adhesive is foamed hot melt, and the molten foamed botmelt is applied upward while the transfer roll 24 rotates. On the plane of the direction, discharge (FM) an amount suitable for the length of the back part B, b of the content B of the above ratio (FM) t, and decrease the temperature of the discharged molten foamed hot melt FM. A method of applying foamed hot melt by roll transfer, which is characterized in that it is suppressed to a minimum and is transferred (FM+) onto the back parts B and b. 2) In a roll-type transfer device for applying adhesive to the back of the book contents moving on a line in the horizontal direction ``'A!'', the transfer roll 2 rotates in the same direction ``'E'' as the direction 1A'' mentioned above.
A foaming type hot melt nozzle 35 is provided facing the rotating upward surface of No. 4, and a pneumatic operation valve 37 that operates an on-off valve in a discharger 36 directly connected to the nozzle is provided.
Further, the electromagnetic valve 38 directly connected to the pneumatic operation valve is electrically connected to the electric position detector 41 for the back of the contents of the above ratio. Coating device. 6) Permissible range of claims The "transfer roll" described in claim 1) is "
A heating element is provided inside the transfer roll, and the surface temperature of the transfer roll is maintained at a certain constant temperature by an automatic temperature control device. 4) The "nozzle" described in claim 2) is "a plurality of nozzles." 5) The "nozzle" described in claim 2) is a "slot nozzle." 6) The "nozzle" described in claim 2) is "position-adjustable." 7) The “transfer roll” described in claim 2) is “
The surface of the transfer roll is treated with a resin that prevents molten resin from adhering. 8) Permissible range of claims No. 2) "Same direction 11E"
” is in the opposite direction 11F〃J. ``A set consisting of a type detector.''