GB2051618A - Coating a web with hot-melt adhesive - Google Patents
Coating a web with hot-melt adhesive Download PDFInfo
- Publication number
- GB2051618A GB2051618A GB8021090A GB8021090A GB2051618A GB 2051618 A GB2051618 A GB 2051618A GB 8021090 A GB8021090 A GB 8021090A GB 8021090 A GB8021090 A GB 8021090A GB 2051618 A GB2051618 A GB 2051618A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mat
- adhesive
- onto
- coated
- web
- 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
Links
- 238000000576 coating method Methods 0.000 title claims abstract description 17
- 239000011248 coating agent Substances 0.000 title claims abstract description 16
- 239000004831 Hot glue Substances 0.000 title claims abstract description 12
- 239000000853 adhesive Substances 0.000 claims abstract description 42
- 230000001070 adhesive effect Effects 0.000 claims abstract description 42
- 239000000463 material Substances 0.000 claims abstract description 38
- 238000001816 cooling Methods 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims description 15
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 2
- 239000010408 film Substances 0.000 description 39
- 238000004513 sizing Methods 0.000 description 26
- 239000002904 solvent Substances 0.000 description 8
- 239000012943 hotmelt Substances 0.000 description 7
- 239000002184 metal Substances 0.000 description 3
- 238000001035 drying Methods 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000007757 hot melt coating Methods 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 239000002313 adhesive film Substances 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001723 curing Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
- B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
- B05C1/14—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a travelling band
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
- B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
- B05C5/0254—Coating heads with slot-shaped outlet
- B05C5/0262—Coating heads with slot-shaped outlet adjustable in width, i.e. having lips movable relative to each other in order to modify the slot width, e.g. to close it
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
- B05C9/08—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
- B05C9/08—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation
- B05C9/14—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation the auxiliary operation involving heating or cooling
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Laminated Bodies (AREA)
- Coating Apparatus (AREA)
Abstract
Coating a web with hot-melt adhesive wherein the web to be coated is cooled by means of an endless mat (5) running in contact with the material web (10). The mat passes via cooling rollers (1, 2). The hot-melt adhesive is preferably extruded at (7) [Fig. 1] onto the endless mat and the web to be coated is thereupon passed into contact with the adhesive-coated face of the mat. Alternatively [Fig. 3], the web is cooled by the mat (5) prior to coating or coated [Fig. 9a] whilst supported on the mat. <IMAGE>
Description
SPECIFICATION
Process and apparatus for coating a band material with hot-melt adhesive
The subject of the present invention is a process for coating a continuously running material web with hot-melt adhesive. Another subject of the invention is an apparatus for the implementation of the process, which apparatus comprises means for melting and passing the adhesive and means for transferring the material web.
Known processes for coating films are, for example:
extruder coating -various roller-application processes -transfer-sizing process by means of a roller -various screen coating processes.
Advantages of hot-melt adhesives as compared with solvent based adhesives are, among other things, the following circumstances: -They do not contain toxic or explosive solvents, but they are 100% adhesive materials.
-In certain applications their properties are considerably better than those of solventbased adhesives.
-The machines used for their application need not be provided with expensive drying tunnels or plants for the recovery or burning of solvent vapours.
-Since the hot-melt adhesives contain no solvents, their energy requirement is only a very little part of the energy required by solvent-based adhesives. The requirement of drying energy of solvent-based adhesives is several dozens of times as high as the requirement of melting energy of a hot-melt adhesive.
An obstacle for an increase in the use of hot-melt adhesives has, however, been the lack of suitable sizing methods.
Since certain films, such as soft PVC, do not stand direct extrusion or hot-melt application onto the film, it has been necessary to treat them with solvent-based adhesives, or a transfer sizing has been performed onto a transfer-sizing film, on which the adhesive has been cooled, and it is only after the cooling that the adhesive film has been transferred onto the film to be sized, by means of a press nip. A drawback of the former process has been toxic, explosive solvents, and a drawback of the latter one has been expensive silicone paper or corresponding special paper, whose using times are, in the best case, limited to a few times. Moreover, the equipment requires an extra reeling apparatus for the transfer-sizing paper.
Hot-melt coating of films has also been performed so that the film to be treated is first coated with a hot-melt material of a low temperature of operation. The temperature range is so low that it does not damage the film to be treated. In the adhesive hot-melt running proper this hot-melt material operating as a carrier substance absorbs so much of the heat of the new coating material into itself that the film cannot be damaged. A drawback of the method is the higher number of running times as well as abundant dosage of expensive hot-melt.
The process in accordance with the present invention is characterised in that the material web to be coated is cooled by means of an endless mat running in contact with the material web, which mat passes via one or more cooling rollers.
The apparatus in accordance with the invention is characterized in that the apparatus includes an endless mat, in contact with which the material web can be passed, as well as one or more cooling rollers arranged in contact with the endless mat.
When a transfer-sizing base is used in which the transfer-sizing film is fastened onto a metal screen or band, the frame material gives the mat strength and functions as an efficient transferor of heat from the adhesive material to the cooling roller. The apparatus is suitable for hot-melt coating of films that are readily damaged by heat. It may also be used for coating thick webs, such as felt and foam plastics. In such cases direct application of the adhesive onto the web would involve excessive difficulties. The apparatus is also suitable for sizing absorbent materials, e.g. fabrics, in which a hot-melt material as molten might penetrate into the material to be coated.
The invention and its different embodiments will be described more closely below with reference to the attached drawings, wherein
Figure 1 is a schematical side view of an apparatus in accordance with the invention when it is used for coating with the aid of a transfer-sizing mat,
Figure 2 shows the same apparatus when a removable film is additionally fastened onto the coated web,
Figure 3 shows the apparatus when it is used without a transfer-sizing mat and the coating is applied directly onto the web,
Figure 4a shows the apparatus when it is used without a transfer-sizing mat and the coating is applied directly onto the web and, thereupon, a removable film is additionally fastened onto the web,
Figure 4b shows the apparatus when it is used without a transfer-sizing mat and the coating is applied first onto a transfer-sizing film, from which the coating is thereupon transferred onto the material web proper,
Figure 5 is a top view of the transfer-sizing mat to be used in the apparatus, with the transfer-sizing film partly removed,
Figure 6 is a cross-sectional view of the transfer-sizing mat,
Figure 7 shows a nozzle to be used in the apparatus as a side view and in section.
Figure 8 shows a section along line I-I in
Fig. 7,
Figure 9a shows the apparatus when it is used so that the coating is applied directly onto a web running on the mat, and
Figure 9b shows an embodiment corresponding that shown in Fig. 9a when a removable film is additionally fastened onto the coated web.
An essential compoent of the apparatus is the transfer-sizing mat 5, which is endless and arranged in contact with two cooling rollers 1 and 2 so that the inside face of the mat runs in contact with the mantle of the roller 1 and the outside face of the mat in contact with the mantle of the roller 2. The rollers 1 and 2 are positioned one above the other, at a distance from each other. A counter-roller 4 is placed against the upper roller 2, in contact with the inside face of the mat 5. The rollers 6 and 6' are fitted one inside the mat 5 and the other outside the mat, thereby forming a press nip, through which the mat 5 passes. The apparatus includes heatable rollers 9 and 9'. Moreover, there are other bending and guiding rollers needed for the mat, by whose means the track of the mat is determined.
Moreover, the apparatus is provided with a third cooling roller 3. Two rollers 8 and 8' are fitted against each other so that a press nip is formed between them. The position of the roller 8' can be adjusted in the direction of the mantle of the roller 8 between the positions 8' and 8".
The adhesive application station 7 is mounted as pivotable so that it can be positioned to apply adhesive onto the transfersizing mat 5, or pivoted from this position over about 90o, to apply adhesive onto the web passing over guide rollers 22 and 22'.
Figs. 5 and 6 show the construction of the transfer-sizing mat to be used in the apparatus in accordance with the invention more closely.
The frame of the mat consists of a metal screen 1 5 or band, which yields the mat strength and at the same time functions as an efficient transferor of heat from the hot layer of adhesive to the cooling roller. The frame material of the mat is coated with a thin film 1 6 that has good detaching qualities. An appropriate film material is, e.g., teflon or silicone rubber. The fastening of the film onto the frame may take place either by lamination, casting, curing, or by any other, corresponding method.
Figs. 7 and 8 show a lip-slot nozzle dragging along the film to be coated or the transfer-sizing mat 5, which nozzle is used as the adhesive application station 7. The frame portion 25 of the nozzle is provided with several vertical channels for the supply of adhesive into the nozzle. Against the frame, a deck portion 21 is fitted as provided with an upper horizontal channel 23 and a lower horizontal channel 24. The channels 23 and 24 are connected to each other by means of several vertical channels 1 7. From the lower horizontal channel 24 the adhesive is passed into the slot 1 8 at the lip opening of the nozzle. Inside the frame 25, heating blocks 20 are fitted. The channels of the nozzle are dimensioned so that the pressure distribution in the lip slot is uniform.
The quantity of adhesive can be adjusted continuously either by changing the running speed of the web to be coated, by adjusting the slot 1 8 in the lip opening, by adjusting the contact angle a of the nozzle, by continuous adjustment of the temperature in the various heating blocks 20 in the lip slot nozzle, or by changing the pressure in the pumps. By exchanging the deck 21 of the lip slot nozzle, it is also possible to produce different figures of adhesive stripes. The figure of adhesive stripes may also be cut into sections in any desired way by adding several pumps and three-way valves to the lip slot nozzle to control the flow of the adhesive.
In Fig. 1 the adhesive application station 7 is in the position in which it applies adhesive onto the transfer-sizing mat 5. The band material 10 to be coated is passed over the roller 9 and thereupon, at the nip between the cooling roller 2 and the counter-roller 4, into contact with the outer face of the transfer-sizing mat 5. At the rollers 6 and 6' there is a detaching nip, where the band material 10 is separated from the mat 5. The band passes the distance between the nips 4 and 6 in contact with the mat, whereby the lower of adhesive that has been applied onto the mat is transferred onto the band material.
The position of the roller 4 can be adjusted in the direction of the mantle of the cooling roller 2 so that the distance that the film 10 passes on the cooling roller 2 and the point of time at which the film meets the hot melt carried by the transfer-sizing mat 5 can be optimized. By means of the adjustment concerned, attempts are made to find a position for the nip at which the film 10 is no longer damaged by the heat of the hot-melt adhesive.
The roller 1 cools the transfer-sizing mat 5 to a temperature as low as possible, whereby the removal of the adhesive from the mat becomes easier. The roller 2 cools the film 10 and keeps its temperature below the damaging temperature. Most appropriately, the temperature of the roller 2 is lower than the temperature of the roller 1. By adjusting the detaching angle of the nip 6, 6', it is possible to find the optimum detaching angle between the transfer-sizing mat 5 and the film 10 to be provided with adhesive.
In Fig. 2 an embodiment is shown in which the coated band material 10 is passed into the nip between the rollers 8 and 8' together with a removable film band 11. In this way, when desired, it is possible to laminate a removable film against the adhesive layer of the coated band in the same working step.
If desired, the apparatus in accordance with the invention may also be used so that the transfer-sizing mat 5 is not used at all. In such a case the adhesive application station 7 is pivoted away from the mat into a position in which the adhesive is passed directly onto the band passing over the guide rollers 22 and 22' and over the cooling roller 3 (Figs. 3, 4a, and 4b). In Fig. 3 the adhesive is passed directly onto the film 10, which passes over the roller 9 onto the rollers 22 and 22'. In
Fig. 4a the adhesive is in the same way passed directly onto the film 1 0. The coated film 10 is passed into the nip between the rollers 8 and 8" together with the removable film 11 that has been passed over the roller 9', and in this way, when desired, the removable film may be laminated together with the film coated with adhesive.In Fig. 4b an alternative is shown in which the adhesive is applied onto the removable film 11 and this film is thereupon laminated onto the band material 10 in the nip between the rollers 8 and 8". In the nip the adhesive is transferred from the removable paper 11 onto the frame material 10.
If desired, the apparatus may also be used so that the adhesive is passed from the nozzle 7 straight onto the film 10 to be coated, Which film runs on the mat 5 (Figs. 9a and 9b). The mat 5 is arranged so that both cooling rollers 1 and 2 are placed in contact with the inside face of the mat. Then the rollers 1 and 2 cool the mat and the mat, on the other hand, further cools the band 10 running on the mat. The coated material web passes along the mat when the mat passes over the two rollers 1 and 2, and hereupon the web is separated from the mat and passes over the roller 9'.
In Fig. 9b an alternative is shown in which the coated material web 10 is passed from the mat 5 into the nip between the rollers 8 and 8", to which nip the removable film 11 is also passed. In Fig. 9b two alternative ways are illustrated for guiding the removable film.
In this way the removable film can also be laminated together in the same working step.
The invention is not restricted to the above embodiment alone, but it may vary even considerably within the scope of the patent claims. Instead of a metal screen, some other flexible base may also be used as the frame of the transfer-sizing mat. The lip-slot nozzle may be replaced by a roller-application device or by any other suitable adhesive-application device.
Claims (10)
1. A process for coating a continuously running material web (10) with hot-melt adhesive, characterized in that the material web (10) to be coated is cooled by means of an endless mat (5) running in contact with the material web, which mat passes via one or more cooling rollers (1, 2).
2. A process as claimed in claim 1, characterized in that the hot-melt adhesive is passed onto the endless mat (5) and the material web (10) to be coated is thereupon passed into contact with the adhesive-coated face of the mat.
3. An apparatus for the implementation of the process claimed in claim 1, which apparatus comprises means for melting arCd passing the adhesive onto the material web (10) and means for transferring the material web, characterized in that the apparatus includes an endless mat (5), in contact with which the material web (10) can be passed, as well as one or more cooling rollers (1, 2) arranged in contct with the endless mat.
4. An apparatus as claimed in claim 3, characterized in that the endless mat consists of a film (1 6) fastened onto a flexible frame material (1 5).
5. An apparatus as claimed in claim 3 or 4, characterized in that it includes a press nip (8), through which the coated band material (10) can be passed so as to fasten the band to a removable film (11).
6. An apparatus as claimed in claim 5, characterized in that it is provided with means for passing the band material (10), in a way in itself known, into contact with a removable film (11) through another press nip (8).
7. An apparatus as claimed in any of the claims 3 to 6, characterized in that the device (7) for passing adhesive onto the transfersizing base (5) can be pivoted away from the position passing adhesive onto the band material (10) or onto the removable film (11).
8. An apparatus as claimed in any of the claims 3 to 7, characterized in that the device (7) for passing adhesive onto the transfersizing base (5) consists of a lip-slot nozzle inside which there are two horizontal channels (23, 24) connected to each other by means of connecting channels (17), whereby the adhesive can be pumped into the first horizontal channel (23) and passed through the connecting channels (17) into the second horizontal channel (24) and from there further between the lips of the nozzle in order to make the pressure distribution in the lip-slot (18) of the nozzle as uniform as possible.
9. A process according to claim 1 substantially as herein described with reference to the accompanying drawings.
10. Apparatus according to claim 3 substantially as herein described with reference to, and as illustrated in, the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI792052A FI792052A (en) | 1979-06-28 | 1979-06-28 | ADJUSTMENT OF ORGANIZATION OF HANDS MEASURES |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2051618A true GB2051618A (en) | 1981-01-21 |
| GB2051618B GB2051618B (en) | 1983-04-07 |
Family
ID=8512753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8021090A Expired GB2051618B (en) | 1979-06-28 | 1980-06-27 | Coating a web with hot-melt adhesive |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS567658A (en) |
| CH (1) | CH642872A5 (en) |
| DE (1) | DE3023115A1 (en) |
| FI (1) | FI792052A (en) |
| GB (1) | GB2051618B (en) |
| IT (1) | IT1132505B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0224855A2 (en) * | 1985-11-26 | 1987-06-10 | Nordson Corporation | Slit nozzle |
| FR2591561A1 (en) * | 1985-12-18 | 1987-06-19 | Owens Illinois Inc | DEVICE AND METHOD FOR APPLYING THERMOSENSITIVE LABELS TO CONTAINERS USING THERMOFUSIBLE GLUE |
| EP0732152A1 (en) * | 1995-03-15 | 1996-09-18 | SCHIEFER, Rolf | Device for applying fluid |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5852981U (en) * | 1981-09-26 | 1983-04-11 | 不二製油株式会社 | Room-temperature gelling material pumping device |
| JPS5971649A (en) * | 1982-10-13 | 1984-04-23 | Fuji Oil Co Ltd | Preparation of fibrous protein |
| DE3802797A1 (en) * | 1988-01-30 | 1989-08-10 | Guenther Dr Schwarz | METHOD AND DEVICE FOR PRODUCING FAST-HARDENING COVERINGS ON CARRIER BOLTS |
| DE3906120A1 (en) * | 1989-02-28 | 1990-08-30 | Beiersdorf Ag | Double-sided adhesive tapes |
| DE19516037A1 (en) * | 1995-05-04 | 1996-11-07 | Nordson Corp | Thermoplastic adhesive application to a surface |
-
1979
- 1979-06-28 FI FI792052A patent/FI792052A/en not_active Application Discontinuation
-
1980
- 1980-06-20 DE DE19803023115 patent/DE3023115A1/en not_active Withdrawn
- 1980-06-26 IT IT23052/80A patent/IT1132505B/en active
- 1980-06-27 JP JP8674880A patent/JPS567658A/en active Pending
- 1980-06-27 GB GB8021090A patent/GB2051618B/en not_active Expired
- 1980-06-27 CH CH495080A patent/CH642872A5/en not_active IP Right Cessation
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0224855A2 (en) * | 1985-11-26 | 1987-06-10 | Nordson Corporation | Slit nozzle |
| EP0224855A3 (en) * | 1985-11-26 | 1988-07-13 | Nordson Corporation | Slit nozzle |
| FR2591561A1 (en) * | 1985-12-18 | 1987-06-19 | Owens Illinois Inc | DEVICE AND METHOD FOR APPLYING THERMOSENSITIVE LABELS TO CONTAINERS USING THERMOFUSIBLE GLUE |
| EP0732152A1 (en) * | 1995-03-15 | 1996-09-18 | SCHIEFER, Rolf | Device for applying fluid |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS567658A (en) | 1981-01-26 |
| FI792052A (en) | 1980-12-29 |
| CH642872A5 (en) | 1984-05-15 |
| IT8023052A0 (en) | 1980-06-26 |
| DE3023115A1 (en) | 1981-01-08 |
| IT1132505B (en) | 1986-07-02 |
| GB2051618B (en) | 1983-04-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |