SE444101B - SET OF TREATMENT OF SAMPLE CARDS WITH RECOVERY OF SOLVENT AND DEVICE FOR IMPLEMENTATION OF THE SET - Google Patents

Description

'1:11 TU 25 J; N¿¿V¿ ,,, __- ¿¿v t,, ._. , ¿., =: __:. ,,, .ß ,, _ ,, ._ _.Q__. Fig. 1 shows from the side with the front parts removed a machine for handling printed circuit boards in accordance with the invention.

Fig. 2 is a detail enlargement of a part of the machine according to Fig. 1. Fig. 3 is a sectional view taken along the line A-A in Fig. 1. Fig. 4 is an end view of the machine inlet with the line B-B of Fig. 1.

Fine 5 shows the inïnpskanwaren in section.

Pig 6 nch 7 shows two integral pairs of guides with t / 11 associated guide galleries, wide pairs of guides and guide grids representing the feed path through the machine.

The wiping machine is described in connection with the handling of piana objects in the form of printed circuit boards, which are coated or laminated with plastic film.

The invention can, of course, be applied to the treatment of patterns which have other properties which must be removed, for example color coats. As an example of such farns, nvh inmperatures can of course be varied 1 bvroundn by nlwka fak- íurcr ü; n dríIL> ïÖrhal1anden.

The T fin 1 rolled machine ánnnfatäar a house 1 and one pa hJseLs one L munLerad inïoppsenhea 3 and one on the house gavr1 Q mnntvrad nglngpggnndq 5, ínlnppsenhutwn 3 has a yLLrv hnrd n, unm nl n is formed by a roll or 2 flæ , pd viïka mnnsrerkortvn pla- aeras inr dai ßïter each other matan in 1 maskinrnß sintnn nvdnining. In- Inçnsenhctcn further has an ínïoppskammare 8 with two rotating vaïsar 9 f G r to mnttaga mónsterkortnn from inïøppsbnrdrt and feed them všdare fn in the house I. søm ínnehåïler the proper treatment zones, via a horisantæïïn snait 10 i. the open chamber 8, which forms the first part of the closed compartment of the machine, is separated from the environment by means of upper and lower open-shaped seals 11, 12, which may consist of Tefïon or similar material, and which are arranged to seal the respective wall. The vases abut each other to prevent outflow of solvent in gaseous form, but then include e1as ~ .qši d. L0 15 20 25 30 SZOSYJIE-Gr? technical material YO, eg Viton ~ rubber material, to allow that even printed circuit boards with a greater thickness, eg up to about 4 mm, can be fed in between. The inlet chamber is followed in turn by the following treatment zones, which are arranged in the hue of the machine: cooling zone 1ß, rinsing zone iii combined rinsing and brushing zone 15, rinsing zone 16, drying and blowing zone 17 and cooling zone 18. This is followed by an outlet chamber 19, which is arranged in the outlet unit 5 and which has two elastic, rotating rollers 20, 21 for receiving the printed circuit boards from the cooling zone 18 via a horizontal slot 22 in the nozzle end 4 and discharging the printed circuit boards on an outer table 23, which a is formed by a plurality of driven rollers or rollers 24. The outlet chamber 14, which thus forms the last part of the closed section of the machine, is kept separated from the environment by means of upper and lower lip-shaped seals 25, 26, which are arranged to abut against respective rollers. In the same way as at the inlet unit 3, the elastic rollers are arranged to abut against each other in a sealing manner.

The different treatment zones are separated from each other by means of vertical partitions 27, 28, 29, 30, 31, which are "provided with horizontal slots, through which the printed circuit boards are fed and which are arranged in the same plane as the inlet" and the outlet slots 10, 22. Furthermore, a plurality of roller pairs arranged one after the other in the treatment zones. In order to take care of the supply of the printed circuit boards, some roller pairs have so-called clamping rollers 32, 33, 34, 35, 36 for removing solvent from the printed circuit boards by pressing. preferably the ring rollers 67, while the lower rollers 67 in these pairs of rollers are suitably made of plate ring rollers The lower rollers in each pair of rollers are driven via a gear arrangement, while the upper rollers are each driven via the lower roller in each pair of rollers.

In each of the end-facing cooling zones a cooler 37, 38 is arranged, which is set to maintain a low temperature of, for example, about 2-8 ° C on the air present in the cooling zone so that the amount of solvent which penetrates from the flushing zone 14 and 14, respectively. dryer »and the blowing zone l? quickly condensed to be collected and diverted to an underlying tank 39 for reuse. ... avm fl nlvqzßmw-ew. ur 20! '\ U "8205330-7" i špøininqszennn innehâïier en første sektion med ett fieriaï sprutmun- tyrërn äi, wwdeist viika iösningsmedei med ett druk av 3 kn / cm? Spfur tas na bada sider av rönsterkorten. Through this intingande spoïning bió Furthermore, the spinning wheel has a second ectin with a "Li fiertaï-like spray nozzle 42, by means of which 165 * ningamedeš with a pressure of 4 kp / cm 2 is sprayed on the previously formed muzzle tubes, including the piastre.

The unloading tank 39 is arranged in the engine housing under the treatment tanks divided into three compartments 43. 44, ih with the bradavinpn tiii eíferiuiiande compartment, the pre-tank tank inside the fiïïai. that is, pure reading medium, which extends from a distillation plant, while the purity of the boiling medium decreases in the direction more than the dense tank compartment 45. Spoininnsxnnnn «24 nozzles di, 3? fed "fi ïö; ningsmedeT from" the last tankavd "inïngen 45 with the help of eva nunnar ii. 53 and äterfOrv> tili this last taniavdaining 45 via av ~ rinningsüare de and grovfiiter 47. which gr0vfi! Í @ in the house meiian the tank and the drainage load. A portion of the contaminated solution medium is transferred to an intrinsic distillation plant at the same time as the pure solvent medium or destiny Fyiïs. In the first tank compartment, in each tank compartment, there is a cooler 48 for dissolving. F. _ ._,,. . . n. nznnamenífi: ad en onskad iaq aemprratur, L ex emnrinq iš ~ L ”L.

In the brushing scene 15 there is an upper rotating brush 49 and a lower rotating brush 50, which have bristles of nyion and which are arranged to mechanically process the printed circuit boards to remove residues of pšaatfiinerra which may occur at certain surface areas nos ndnsLerkorLen. rare ncn: rear each rotating brush there is one: prntmnn piece 53, 54 far apeining of the sample cards with Idsningsmedei of uLL Lryçk of 1.5 knfcmg which iiiïföred from the meiianïiggende tnnkavdeiningwn medeist a pump az.

In the subsequent cleaning zone, the printed circuit boards are treated with clean solution medium, the solution medium being fed under a pressure of 2 kp / cmg from the first tank compartment with a pump 56 and the upper and lower spray nozzles 68, 69. In the terkninu§ ~ nrn blowing zone there is a blowing device bi placed above the framing path to treat the monsier grains with a watered air chamber of eg 40 ~ 50OC, va in the lead model, Qom remains on the surface nen any needle spaces in the moneter cards, quickly removed by Due to the mechanical influence of the air flow and transferred to the gas form so that the air flow has a pressure of 1 kn / um ”. The solvent nlflna lnif-n inner: through an outlet 58 to a cooler 5%, in which lo id ninoen id: orLeran use. Unn from the radiator uíuaundo losninggmwd fl ï fi r d poor lnfien eng: to a knmprimator 60, whereby the air is heated to said temperature To be blown out through the blower device 57. Herein nennrïffhñllz an eirkulorande circuit dennlnnn for the air for the air. Gaseous and then returned to be blown out on the printed circuit boards in the zone. There is thus no supply of air from the outside of the machine for drying the printed circuit boards. By allowing the air to circulate in the manner described, constant pressure needle V can be maintained in the machine in an advantageous manner. On the upper side of the machine nose there are a plurality of inspection hatches 61, through which access is obtained to the various treatment zones for service and inspection work, each inspection hatch having downwardly directed circumferential flange portions 62, which in the closed position of the hatch rest in circumferential grooves 63, which are filled with water so that effective water traps are formed. With a drip device (not shown), water is automatically filled in the gutters, enm communicates with each other so that the water traps are always secured. Similar hatch arrangements with flanges the gutters to form vaiienlåš are also available on the solvent tank, which water traps are maintained by automatic filling of water. 30 The coarse filter 4? which are arranged in each drain line from the treatment zones, are easily + inaccessible from one long side of the hood and can be quickly opened by means of a combined screw * and shackle load lid 65 for replacement of files 64 after the solvent has drained from the filter condenser via a lower valve, wherein the filter container is located above I'o 20 '25 30 8205330-7 6' liquid level in the respective tank compartment. By such drainage and placement of the filter containers, the filter can be replaced after a certain downtime, without large amounts of solvent escaping into the environment.

See the lower rollers support a guide grid 71 divided into sections, on which particularly thin printed circuit boards rest during the feed for correct guidance in the roller nip. A similar guide grid 72 is arranged to be supported by the upper rollers so that a desired small space is obtained between the two guide grids. whereby the upper control grid serves as control for particularly thin printed circuit boards. By storing the upper rollers in vertical guides, even thicker printed circuit boards can be fed through the machine in that the upper rollers are raised in accordance with the thickness of the printed circuit boards. Since the upper grids are supported by the axes of the upper rollers, these grids will also be raised so that said gaps between the guide grids increase correspondingly to a desired manner. The rollers of the tables in the inlet and outlet units also carry guide grids similar to the lower guide grids 71.

At the inlet and outlet units there are connections 73 for venting the small amounts of solvent which may escape from the normally closed treatment compartment as the printed circuit boards pass the first and last nip, respectively. These connections also provide ventilation of the interior spaces of the engine room. The solvent used is one which is not easily flammable and which is comparatively non-toxic. Of these, chlorinated hydrocarbons and, above all, methylene chloride, which have a boiling point of ÅUÜC, are preferred. To reduce loss by evaporation, the methylene chloride is kept in the tank at a low temperature, eg 15-20 ° C as indicated above. The air blown out in the drying and blowing zone suitably has a temperature which is between about 00 and about 10 ° C above the boiling point of the solvent, i.e. about 40 ~ 50 ° C for the methylene chloride, so that the solvent is effectively removed from the printed circuit boards by evaporation in combination with the mechanical impact from the outflowing air. tšíšílfåššü fl? By means of the invention, the external suction installers can be reduced to a significant extent in that only small amounts of solvent can be expelled from the substantially closed treatment compartment.

The machine is thus a so-called stripping machine for printed circuit boards and works completely automatically with a well-closed system and with lnnlflilnnliw »him ilnmrlig recycling; of used llisvlinnnluyllul tnfllonl kundenaeršng nen distillation. Thus, the invention has thus been able to reduce the consumption of lending agents, while at the same time reducing the amount of working space required by the machine, and relatively small emissions of solvents to the outside air need to be made.

In the embodiment shown, a compressor is used to circulate the air in the said circuit at the same time as the compressor is in a desired temperature rise. although this is a preferred embodiment, other arrangements can be used to achieve these two effects, for example a fan which is placed in a suitable place in the circuit, for example in the blowing device, and which sucks air from the drying and blowing zone via the cooling means 59 and blows out the air through the blowing device 57, whereby the air can be heated by means of suitable heating means located in the connection between the cooler and the blowing device. If desired, heating elements can be placed directly in or adjacent to the drying and blowing zone to maintain the elevated temperature. Radiation heating can also be used as the sole heat source or in combination with any of the heat sources described above, the heat rays being directed directly at the pattern area.

Said range about 0 ° = 10 ° C above the boiling point of the solvent is preferred, but the temperature of the air can be varied both downwards and upwards, for example from about 10 ° C below the boiling point of the solvent to about 2895 above said boiling point.

Claims (5)

'å 3G f (m 6 ~ w Kâlšälšßàí 1. In the treatment of printed circuit boards, in particular printed circuit boards coated with layers of paste or paint, in a machine having a substantially thin treatment compartment for removing said layers from the printed circuit boards by means of a moist solution medium, the treatment being carried out in each of the following treatment zones comprising at least one twisting zone (14, 15, 16) and a subsequent drying and bending zone (17), in which the printed circuit boards are exposed to an air stream for removal of the remaining release medium on the printed circuit boards, And the storage zone (17) is brought to circulate in a circuit, during which (often a cooling means (59) arranged in the machine passes for condensation of the liquid medium present in the air, after which it is brought back to the solution medium. flow out on the printed circuit boards, and whereby the condensing medium condensed in the machine is reinserted into a tank present in the machine (39: irnehåï). Tosningsmeoeï for said spoining, characterized in that before the cleaning zone (14, 15, 16) and after drying: ~ but the heating zone (1?) the pattern cards are passed in the bathing compartment for existing cooling zones (13 and the cooling zones, respectively), air fürefintiigt iosningsmant is brought to condense to be avïedas from the kyiníngszones (13 reseektive šäëd A method according to claim 1, characterized in that before the cooling zone (133) the printed circuit boards covered with said layer are caused to pass an inlet chamber (8), which is sealed from the environment and which communicates with the cooling zone (13) via a horizontal space (IG). ) with a sufficient height which allows the printed circuit boards to pass through, and that after the cooling zone (18) the printed circuit boards cleaned from said layer are passed to an outlet chamber (19) which is sealed from the surroundings and which communicates with the cooling zone (18) via a horizontal spaït (22) with a tiïïreciig height which allows the implementation of the printed circuit boards. * ïkšlí fi ifíg kxazšiišš fi 'awl fi æåäa fi ššalaèæâufßa¿i,; ç, .yy ;; iis.qs; uï; ~ .. "» ;, f »f; '-.:': = I ~> ~ '” * LJ 20 829535047' 3. A claim according to claim 1 or 2, characterized in that the spinning is formed in three spaced apart zones consisting of a spinning zone (ln) for the initial splitting of the layers with the application of a layer within a first section with a lower pressure. Gen dels aviägsnandë av deiar av skichten medeïst 1ösnings = medci,: Um appiicaras innm en andra sektion næd ett nngre druk; an knmninnrnn: nniníngsf och borstningszun (153 für aviäqsnande av rester av axikten; samt en renspoinignszon (in) for avniicerinq av rwnt inænsnnämvnßi på mö fi twrkortsn. 4. A method for implementing the method according to any one of claims 1 to 3 in the handling of printed circuit boards, especially printed circuit boards which are of different colors and colors, in a machine which is essentially a closed treatment compartment for the purpose of handling. layer from nmnaiarknrten medeist a moist iøsninqsmedei; iuftstrøninwt nwnsterkorten, and the machine comprises a cooling device (59), which is connected to the drying and assisting zone (17) for condensing the drying agent from the extracted and ciwkuieras from the drying ngn büäüïning for the operation. circuit ispp from the drying and níïsnings zone and again via the xyïsrganet (59) nn fi niä fi nrganet (57), and a tank (39) man ïönningsmnnei for the said s ~ u1ning øch for receiving the solution announced in the machine, characterized in that a cooling zone (cabbage arranged before the spinning zone (14, 15, 16) comprising $ tt_ky1 means (37) is capable of receiving the existing solution which penetrates, from a cooling zone (18) 'is arranged after the drying and bending zone (17), which comprises a cooling device {38} for condensing the present defrosting medium which protrudes from the drying and bending zone (17). 6:23 hä 'íïï * Vi fw) o LM C231 l' <1 19 Device according to claim 4, characterized in that an inlet chamber (8) is arranged in front of the cooling zone (13), which communicates with the cooling zone (13) via a small space (10) and which comprises at least a pair of flexible adjacent wires. (9). wherein the inlet chamber (8) is sealed from the environment by co-formed seals (11, 12), which are arranged to abut against the respective roller, and that an outlet cutter (19) is arranged after the cooling zone (18), which communicates with the cooling zone ( 18) via a sme! gap (22) and comprising at least one flexible abutment (20, 21) abutting each other, the outer chamber (19) being sealed from the environment with open-shaped seals 25, 26) arranged to seal aniigga mot resoektive vais.