JPS5996996A - Method and device for discharging cloth to back of book madeof foamed type hot melt - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses a foamed hot melt as an adhesive for the back of a book in bookbinding operations, and relates to a method and apparatus for dispensing the foamed hotmelt.

Conventionally, hot melt adhesives have often been used as adhesives for attaching covers to the backs of books. During these pasting operations, hot melt was applied to the back part, and then a cover was pasted to the core part. A side view of an example of these devices is shown in FIG. Inside the hot melt melting tank 11, there is pelletized hot melt HM.
o is put into the tank and heated and melted by the heater 12 provided at the bottom of the tank. The molten hot melt H
The lower part of the transfer roll 4 is immersed near the liquid surface of M2, and a part of the molten hot tart adheres to the surface of the transfer roll, and then rotates up (nM, ;) and reaches the top position. Molten hot melt HM adhering to the transfer roll surface; ,! 1. The molten hot melt is transferred ()IM) onto the back of the book by bringing it close to the back Bb of the book B which is being moved in the horizontal direction "A".

In addition, the contents B of the book are chucked one by one by the chuck plates 1 and 2, and since the chuck plates are moved endlessly and continuously by the chuck 7 (not shown), the back Bb of the contents B of the book is is continuously brought into close proximity to the transfer roll 4, and molten hot melt is adhered (HM) thereto. 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 flat-throat conveyor belt 16 is applied from below the moving chuck plate.
comes running, merges with the back surface of the chucked book, and runs in the same direction and at the same speed. Covers C' are stacked on the flat belt conveyor in advance at appropriate positions, and at the merging position, the covers C'' are moved by the pressure plate 15 below the flat held conveyor 16 for the book B''. The back part of is pressurized (Pl) and bonded 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 hot melts have been attracting attention instead of hot melts as adhesives for attaching covers in the bookbinding process.

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.
It is made by mixing gas such as Co2 in the form of countless closed bubbles, and the volume of the bubbles is necessarily 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. Liquidity(
thixotrophic properties), thinning of the adhesive layer by pressure bonding and expansion of its bonding area, resulting in shorter set time, improved adhesion to porous and rough surfaces, and rapid cooling of the surface. Adhesion processing, expansion of low-temperature applications, increased elasticity, improved sealing performance, extended open time, 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 there are many problems in handling the book. It was found that it has the following 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 a foam-type phone melt 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 hot melt is forced flat by hand, the hot melt solidified into a plate shape on the back of the book will spread onto the opened sheet. It may get wet at the binding part and crack into strips. 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.

(B) As in items (1) and (2) above, when using foamed Botmelt, the 7th part of each sheet can be opened flat, so the printing space can be expanded accordingly.

(4) When you open a book bound using conventional hot-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 foam hot melt is about the same as for conventional hot melt, which greatly contributes to cost reduction and energy saving.

(6) When using foam hot melt, the open time is approximately 50% longer than conventional bot melt, but on the other hand, the cent time during crimping is shortened, contributing to increased production speed. I will do it.

The above are the new effects that can be obtained when foamed hot melt is used as an adhesive in bookbinding. It is an object of the present invention to provide the simplest method and apparatus for attaching a cover to the spine by spraying.

The method according to the invention is illustrated in FIG.

Please refer to FIGS. 2 and 6. In the cover pasting device, a foaming hot melt is applied from a nozzle 25 and a discharger 26 provided upward from the bottom to the lower surface of the spines B and b of the contents of the book that are being moved while being sandwiched between the chuck plates 21 and 22. A method of discharging upwardly and immediately thereafter adjusting the thickness of the dispensing part using the doctor roll 35 for the dispensing part in the same manner as described above to obtain a desired foamed hot melt dispensing layer. be.

Next, the apparatus of the present invention based on the above method will be described. A foam hot melt nozzle 25 is placed below the known traveling device of the chuck plate 21, 22, that is, at a certain required distance \d from the lower surface of the back of the book contents chucked on the chuck plate. facing upward. The nozzle is a discharger 26
The discharger is directly connected to a pneumatic operation valve 27 that operates the opening/closing valve of the foaming type phone 1-melt built into the discharger.
The pneumatically operated valve is directly connected to a solenoid valve 28 that operates the valve. Further, the solenoid valve is electrically connected via an amplifier 61 to an electric detector 15 placed in place, and the pneumatically operated valve is connected to a pipe 66 to an operating air source OA, and further Further, the above-mentioned discharger is connected to a foaming type hot melt applicator 30 by a heat-resistant and pressure-resistant hose 29.

Next, the operation of the above device will be explained. By a known chuck plate traveling device, the contents B1 of the chucked book travel on the same line with its backs B and b facing downward. When the electric detector 15 detects the running back, the current amplified by the amplifier 61 excites the solenoid valve 28, and the pneumatic operation valve 2 is directly connected to the solenoid valve.
Operate 7. Since the pneumatic operating valve is connected to the operating air source, it is actuated by the air pressure, and the pneumatic operating valve opens the on-off valve in the discharger 26 to discharge foamed hot melt through the nozzle 25 (FM ) L, and the back B of the book mentioned above. Immediately after that, the thickness of the discharged cloth is adjusted by a doctor roll 65 whose position is set in advance, and the thickness of the discharged cloth is adjusted to the foamed phone 1 of the prescribed discharged cloth layer.
- the melt is dispensed onto the back surface.

As mentioned above, the foamed hot melt is applied to the spine of the book to ensure that the foamed hot melt permeates into the minute gaps in the spine and sufficiently adheres the sheets at the so-called gutter of the spine. In addition, since foamed hot melt expands several times more than conventional hot melt, foamed hot melt can be dispensed in a larger amount (in terms of volume) than conventional hot melt. Of course, between each paper leaf,
The foamed hot melt can be applied sufficiently to both sides of the back, and the strength of the cover can be further increased after all. In other work processes, the open time can be longer and the set time can be shortened, which not only increases work efficiency but also saves adhesive usage (weight) to just a few minutes. Furthermore, after the binding is completed, the user of the book will be provided with the following:
This makes it easier to open the book when handling it, making it possible to open the book's throat flatly. This also contributes to expanding the printing space on each sheet, and as mentioned above, many Benefits can be obtained.

[Brief explanation of drawings]

Figure 1 is a side view of the device for pasting the conventional cover.
The figure is a side explanatory view of the method and apparatus for dispensing foamed hot melt onto the back of the book contents according to the present invention. 22...Chart plate 4...Transfer roll 5...Heater 6,55...Doctor roll 7...Tokuku knife 11...Hot melt melting tank 12...Tank heater 16.
・Flat belt conhair 15...pressure plate 2
5... Nozzle 26... Discharge device 27... Pneumatic operation valve 28... Solenoid valve 29... Heat-resistant and pressure-resistant hose 60... Applicator for foaming hot melt VA〃... Chuck plate The running direction of B, B,・
...Contents of the book B, b...Back of the book's contents c', c
″...Cover page FM, FM:... Foaming type hot melt HM... Honoto melt procedural amendment (method) June 2z, 1980 1, Indication of case 1982 Patent Application No. 207422 2, Invention Name: Method and device for dispensing foamed hot melt onto the back of a book 6 Relationship with the case of the person making the amendment Patent applicant address: 4-10-74 Minamijo, Honbunagawa-ku, Tokyo, 140, subject of amendment (1) (2) “Drawings” 5. Details of the amendments are as shown in the attached sheet. There are no changes to the engravings of the specifications and drawings.

Claims (1)

[Claims] 1) A foam hot melt is discharged upward from below through a nozzle onto the lower surface of the back of the book, which moves horizontally with the back of the book facing downwards. A method for dispensing foam-type hot melt onto the back of a book. 2) A nozzle 25 attached to a foam hot melt discharger 26 is provided below the running line of the chuck plate 21, 22 at a certain required interval ttd rr, and an on-off valve in the discharger is operated. The pneumatically operated valve 27 and the electromagnetic valve 28 for actuating the pneumatically operated valve are electrically connected to the electric detector 15 for detecting the back of the contents of the book chucked by the chuck plate. A device for dispensing foamed true melt on the back of a book, characterized in that a doctor roll 35 is provided at a certain distance in the direction of travel of the running line on the lower surface of the back of the book. 3) The "nozzle, doctor roll, and electric detector" described in claim 2) is "adjustable in front, back, left, right, top and bottom positions." 4) The number of "nozzles" described in claims 2) and d) is "plural." 5) Claims 2), 6), and 4) in which the "nozzle" is 1/J. 6) Claims 2) and 7) ``1 electric detector'' as described is ``2 sets, of which 1 set, /) is the first stage electric detector for the top, and the other cents are the second stage electric detectors for the end.'' .