Narrow slit type coating mold and method for producing the same

Abstract

The invention provides a slot-typed coating die and a manufacturing method thereof. The die comprises a module, a plurality of distributors and a plurality of heating devices which are arranged along the length direction of the module at intervals; each distributor is provided with a liquid inlet and a liquid outlet which are communicated with each other by a liquid passage, as well as a valve component which can open / close the liquid passage in an operable way; the module is provided with a slot which extends along the length direction and opens to the front end of the module; a plurality of uniform-flow troughs are formed in the slot; at least a liquid inlet pipeline, a liquid accumulation chamber which extends along the length direction and is communicated with the liquid inlet pipeline, as well as a plurality of first liquid manifolds and a plurality of second liquid manifolds which are corresponding to a plurality of distributors are formed in the module; each first liquid manifold is communicated with the liquid accumulation chamber and the liquid inlet of the corresponding distributor; each second liquid manifold is communicated with the uniform-flow trough in the slot and the liquid outlet of the corresponding distributor. The manufacturing method of the invention comprises that the end surface of the opening of the slot is ground under the simulation working state so as to lead the planeness to achieve the required precision.

Description

technical field [0001] The invention relates to a slit-type coating mold, which can uniformly and accurately apply liquid to a coil or carrier through a slit extending along the length direction of the mold, and is especially suitable for hot-melt adhesive coating operations. The invention also relates to a method of making a slot die. Background technique [0002] Slot coating equipment is known for applying liquids to continuously conveyed webs or supports. Slot coating equipment usually has a machine frame, a coating device for applying liquid, a roller set for continuously conveying webs or carriers, and corresponding transmission, power and control devices. The coating device includes a coating mold and a supporting device for installing the mold on the frame. The coating mold is assembled from modules, liquid distributors, gas distributors, heaters, filters and other components. The modules are formed with manifolds and A slit running the length of the module. In op...

AI Technical Summary

Problems solved by technology

However, since the hot melt adhesive liquid has high viscosity and its fluidity changes greatly due to the influence of temperature, the following problems often occur when the hot melt adhesive liquid is applied by the slit coating equipment: the hot melt adhesive liquid in the mold It is difficult to accurately control and adjust the supply and delivery of the hot melt adhesive liquid; it is difficult to heat the hot melt adhesive liquid uniformly and constantly in each section of the mold so that the liquid maintains a uniform flow; it is difficult to maintain the hot melt adhesive liquid along the length direction when it is discharged from the slit Evenly distributed, prone to defects such as discontinuities

The existence of the above problems has affected the quality and effect of coating

Especially for molds with larger lengths, the above problems become more serious, which limits the length of molds and cannot meet the needs of high-efficiency and high-quality coating operations on wider carriers

[0004] Not only that, in order to maintain good fluidity of the glue solution during coating, the coating mold is continuously heated by the heating device, and the coating mold will thermally expand and contract, especially because the length of the mold is relatively large, so the thermal expansion and contraction along this direction If the amount is large, it will generate a large thermal stress, which will cause deformation of the contact surface between the slit and the coil or carrier surface, and affect the uniformity of coating

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