Method of cutting long-length printed cable

FIELD: printing industry.

SUBSTANCE: in the method of length cutting of the printed cable the preliminary roll preform is isolated, then in the interwire gap the process slot is formed, into which the cutting element is inserted. Then, power is supplied to it, bringing to the predetermined temperature regime, then the displacement of the heated cutting element is carried out along the longitudinal axis of the printed cable.

EFFECT: provision of quality longitudinal cut in the interwire gap without compromising the integrity of the side insulation on the cut printed cables, reduction of defects, complexity and cost of production.

4 cl

 

The invention relates to the manufacture of printed long cables with thermoplastic lacquer or foil insulation, and more particularly to a cutting group of the workpiece on a separate printed circuit cables, which are by definition a special case of printed circuit boards.

For example, in GOST 23752-79 "PRINTED circuit BOARD. General technical conditions", the term "flexible printed cables (GIC)" is mentioned in almost all the standard sections, starting with the preamble.

Modern equipment photochemical processes the receipt of all Board elements both on hard and on a flexible basis occur in group the workpiece with a size of 400×400 mm group procurement is based on the reference holes, and the finished boards from felled by stamp.

However, this technology is unacceptable to raskryvanie group blanks printed long cables - the newly created passive electrobalance in the context of the objective process of miniaturization ERA. For group procurement of long flexible printed cable is a tape longer than 20 m, a width of the order of 100-200 mm and a thickness of 0.1-0.2 mm, and the pitch of the printed conductors in the most common version is 1.25 mm when the width of the printed wire 0.7 mm and, accordingly, the value bezprovodovogo gap is 0.5 mm.

Known RF patent№2342813 from 27.12.2008 G., in which the cutting group billet to a separate flexible printed circuit cables are carried out by a remote conductor. This operation is only possible on the printed cables with thermosetting varnish insulation.

Also known USSR author's certificate No. 911748, NC from 3/06 07.03.1982., which in the printed cables with thermoplastic adhesive film and insulated from the bulk material in front of its insulation removed individual printed conductors adjacent to future vykraivaem cable. This method creates quite a free zone longitudinal cutting of the workpiece on the individual cables. And cutting can be done manually with scissors with a low probability of damage (badly) side of the cable insulation. However, the process of removing (detaching) of the individual printed conductors of the galvanic copper with a thickness of about 50 μm, and even with local heating of a trace at the place of exfoliation, it is highly labour-intensive and, due to low mechanical strength of the individual conductor often leads to its breakage, which generally unacceptable for small-scale production. And device for its mechanization is very difficult and expensive.

Common features offered by the authors of the way of cutting long-length printed cable is the presence of thermoplastic insulation, local heating.

Unlike the prototype predlagaemom the authors way of a separate conduit, separating neighboring group in the procurement of cables is not removed, and its side edges serve as guides for movement of the cutting element, for example a wire.

Thus, the objective of this technical solution was the creation of the mechanized method of slitting printed long cables with thermoplastic insulation, allowing for high-quality longitudinal cut in besprovodnikovy the gap without compromising the integrity of the lateral isolation cut on the printed cables and to reduce spoilage, the complexity and cost of their manufacture.

This object is achieved in that the cutting process printed long cable with thermoplastic insulation containing parallel and rectilinear traces separated besprovodnikovy clearance, and interaction with the cutting element lies in the fact that the pre-blank printed circuit cable are isolated by forming printed conductors, then printed on the cable in besprovodnikovy the gap of technological form a slot into which enter the heating element, then served him the food, bringing the preset temperature, then carry out the movement of the heated cutting element along the longitudinal axis of the printing cable.

In particular cases, i.e. in concrete forms �of spalania, the invention is characterized by the following features:

- cutting element made in the form of wire,

- at least one of the mounts of the cutting element after its introduction in besprovodnikovy the clearance is extended to the side remove the printed guide,

- cutting exercise two cutting elements,

- both of the cutting element are located in the cross section cut printed cable,

- cutting elements during the cutting apart,

- cutting pressed the heated cutting element to a lateral edge to be deleted in the printed guide,

- the width of the cutting element is chosen smaller than the width bezprovodovogo gap

- temperature of the cutting element chosen between the points of flow and degradation of the insulating material.

It allows to make a conclusion about the causal connection between the set of essential features of the claimed technical solution and achievable technical results.

These features, distinct from the prototype and covered by the requested object of legal protection, in all cases sufficient.

When implementing the method of cutting long-length flexible printed cables new sequence of operations and their nature allows, in particular, due to the isolation of the printed circuit cable before cutting and use�ing deleted in the printed guide as guide supports for the heated cutting element to provide high-quality longitudinal cut in besprovodnikovy the gap without compromising the integrity of the lateral insulation of cut on printed cables and to reduce spoilage, the complexity and cost of their manufacture.

Special cases, i.e. specific forms of performance, allow:

- cutting element made in the form of wire, eliminating the need based heating element, for example in a flat performance, relative to the longitudinal axis of a flexible and elastic parts as a flexible printed cable. In addition, the heated wire having a much smaller mass in contrast to the more developed of the heating element has a lower thermal inertia. This allows you to localize the width of the cut, preventing melting in besprovodnikovy gap material, and the remaining insulating lateral surface of the outer conductor of the printed cable, i.e., to minimize the cutting width;

- at least one of the mounts of the cutting element after its introduction in besprovodnikovy the clearance is extended to the side remove the printed guide, it allows you to press the cutting element to remove the printed conductor;

- cutting uses two cutting elements, which allows to increase the productivity of the cutting process;

- both of the cutting element, located on the cross section cut printed cable, trim lateral components of the forces from every place of the cut in otdelno�and;

- cutting elements during the cutting apart, which allows to cover the arc cut both printed conductor;

- ensures the pressing of the cutting element to a lateral edge cut off in the printed guide, it allows you to save the width and electrical properties remaining in isolation besprovodnikovy the gap adjacent to the outermost side of the printed conductors cut cable;

- wire select less than the width bezprovodovogo gap, in case of extreme traces are workers, not technological;

- temperature of the heating element is selected between the points of flow and degradation of the insulating material, thus reducing the forces involved in the cutting area.

Thus, the new sequence of operations and their nature allows, in particular, due to the isolation of the printed circuit cable before cutting and use of cut off in the printed guide as a guide support for the cutting element to provide high-quality longitudinal cut in besprovodnikovy the gap without compromising the integrity of the lateral isolation cut on the printed cables and to reduce spoilage, the complexity and cost of their manufacture.

On the basis of the proposed method of thermal cutting printed long cable with thermoplas�base insulation developed manufacturing process for a printed circuit cables and put into mass production.

1. Method of cutting long-length printed cable with thermoplastic insulation containing parallel and rectilinear traces separated besprovodnikovy gap, by interaction with the cutting tool, characterized in that the pre-blank printed circuit cable are isolated by forming printed conductors, then in besprovodnikovy the gap of technological form a slot into which enter the cutting tool, removing one of his mounts in the direction of the cut in the printed guide, then on the cutting tool serving food, displaying at a given temperature, then carry out the movement of the heated cutting tool along the longitudinal axis of the printing cable.

2. A method according to claim 1, characterized in that the cutting tool is made in the form of wire.

3. A method according to claim 1, characterized in that when cutting heated cutting tool is pressed against a lateral edge to be deleted in the printed guide.

4. A method according to claim 1, characterized in that the temperature of heating of the cutting tool choosing between points of the flow and degradation of the insulating material.



 

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