GB2224107A - Drying printed circuit boards - Google Patents
Drying printed circuit boards Download PDFInfo
- Publication number
- GB2224107A GB2224107A GB8820325A GB8820325A GB2224107A GB 2224107 A GB2224107 A GB 2224107A GB 8820325 A GB8820325 A GB 8820325A GB 8820325 A GB8820325 A GB 8820325A GB 2224107 A GB2224107 A GB 2224107A
- Authority
- GB
- United Kingdom
- Prior art keywords
- printed circuit
- circuit boards
- conveyor
- louvre
- 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.)
- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B15/00—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form
- F26B15/10—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/22—Secondary treatment of printed circuits
- H05K3/227—Drying of printed circuits
Abstract
In a louvre dryer, for drying printed circuit boards, of the type having upwardly and downwardly moving conveyor belts for moving printed circuit boards, supported on louvre supports, through an array of drying zones, there are provided a pair of vertical fixed guide rails (6) for engaging with the leading edges of printed circuit boards carried by the upward moving conveyor, the edges of the rails engaging with the printed circuit boards being, at least in their upper parts (7), at a slight angle to the vertical and inclined towards the printed circuit boards whereby to move them slightly during periods of upward motion of the conveyor. <IMAGE>
Description
Drvina APParatus
This invention is concerned with improvements in and relating to drying apparatus. More particularly, the invention is concerned with apparatus for drying printed circuit boards to which have been applied a layer of a driable coating material, especially a layer of a '|solder resist" which has been applied by a curtain-coating process.
A known form of drying apparatus for drying printed circuit boards, the so called "louvre" dryer, basically comprises a housing defining one or more drying zones (to which hot or cool air is supplied to assist in drying) and means for moving the printed circuit boards through the drying zones, basically by firstly raising them vertically by appropriate conveying means, transferring them from the upward conveying means to downward conveying means and, after drying, removing them from the downward conveying means. The conveying means employed to raise and lower the printed circuit boards are of the so-called louvre" type. Thus each conveying means comprises a pair of endless belts, mounted on suitable bearing and driving means, with one face of each belt generally parallel to a face of the other and with both such faces generally vertical.Each belt is provided with a plurality of slats or louvres arranged with their major axes generally horizontal and their minor axes at an angle to the horizontal. The slats on each belt are so arranged that the slats on one belt are at the same vertical level as those on the other belt and also are arranged so that pairs of facing slats on each belt have their facing edges lowermost, i.e. they form between them part of a V-shaped arrangement, for supporting a printed circuit board. As will be appreciated, by having these facing slats angled in this way it is possible for the conveying means to carry printed circuit boards of varying sizes without necessitating alteration of the spacing between the belts.
In operation the belts, and hence the slats thereon, are moved stepwise and thus, for any particular printed circuit board, the series of steps involved comprises firstly a feeding step onto the upward conveyor, stepwise movement up that conveyor until the board reaches an upper part of the conveyor, transfer across from the upward conveyor to the downward conveyor, stepwise movement down the downward conveyor and, finally, removal from the downward conveyor.
We have found that, in the drying of printed circuit boards coated with solder resist, there is a tendency for boards on the upward moving stack to become stuck to or adhered to the supporting louvres or slats, due to the action of heat on the coating material.
In accordance with the invention there is provided a louvre-type dryer of the type described provided with a pair of vertical fixed guide-rails for engaging with the leading edges of the printed circuit boards carried by the upward moving conveyor, the edges of the rails engaging with the printed circuit boards being, at least in their upper parts, at a slight angle to the vertical and inclined towards the printed circuit boards whereby to move them slightly during periods of upward motion of the conveyor.
In order that the invention may be well understood reference will now be made to the accompanying schematic drawings in which:
Figure 1 is a side view illustrating the operation of a louvre dryer;
Figure 2 is a vertical section showing the operation of louvre-type conveying means;
Figure 3 is a side elevation showing the operation of a guide rail mounted in a louvre-type drying apparatus in accordance with the invention.
As shown in Figure 1, in a louvre-type dryer the boards 1 are fed from a horizontal conveyor 2 into an upwardly moving stack supported by a louvre-type conveyor; transferred from that stack to a downwardly moving stack supported by another louvre-type conveyor and finally transferred back to conveyor 2.
As shown in Figure 2, louvre-type conveying means basically comprises a pair of endless belts, 3 and 3 mounted upon appropriate drive and support rollers 4 and provided with louvres or slats 5, facing pairs of which can support a printed circuit board 1, as shown. As will be appreciated, the arrangement shown in Figure 2 may be adapted for upward or downward movement of the printed circuit board 1.
As shown in Figure 3 of the drawings, a louvre-type dryer in accordance with the invention is provided with guide rails 6 having edges 7 in contact with the leading edges of printing circuit boards 1 supported on slats 5. The upper part of guide rail 6 is inclined slightly to the vertical so as to cause the printed circuit boards 1 to move rearwardly a small distance on upward motion thereof.
Claims (2)
1. A louvre-type dryer of the type described provided with a pair of vertical fixed guide-rails for engaging with the leading edges of printed circuit boards to be carried by the upward moving conveyor of the dryer, the edges of the rails engaging with the printed circuit boards being, at least in their upper parts, at astight angle to the vertical and inclined towards the printed circuit boards whereby to move them slightly during periods of upward motion of the conveyor.
2. A dryer as claimed in claim 1 substantially as hereinbefore described with reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8820325A GB2224107A (en) | 1988-08-26 | 1988-08-26 | Drying printed circuit boards |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8820325A GB2224107A (en) | 1988-08-26 | 1988-08-26 | Drying printed circuit boards |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8820325D0 GB8820325D0 (en) | 1988-09-28 |
| GB2224107A true GB2224107A (en) | 1990-04-25 |
Family
ID=10642784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8820325A Withdrawn GB2224107A (en) | 1988-08-26 | 1988-08-26 | Drying printed circuit boards |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2224107A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB366323A (en) * | 1931-03-14 | 1932-02-04 | Paul Albert Wohlfeld | Drying printed sheets |
-
1988
- 1988-08-26 GB GB8820325A patent/GB2224107A/en not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB366323A (en) * | 1931-03-14 | 1932-02-04 | Paul Albert Wohlfeld | Drying printed sheets |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8820325D0 (en) | 1988-09-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |