Novel processing and coating dryer for polrvinyl chloride/polyvinylidene chloride medicinal composite sheet and use method thereof

Abstract

The invention discloses a novel processing and coating dryer for a medicinal polrvinyl chloride / polyvinylidene chloride (PVDC) composite sheet, comprising a first vertical drying tunnel, a second vertical drying tunnel, a Nth vertical drying tunnel, an arch-shaped horizontal drying tunnel, an adhesive groove, a PVDC emulsion groove, a coating roller and a turning roller, wherein the arch-shaped horizontal drying tunnel is arranged on the multiple vertical drying tunnels, the adhesive groove is arranged below the first vertical drying tunnel, the PVDC emulsion groove is arranged below the vertical drying tunnels from the second vertical drying tunnel and the Nth vertical drying tunnel, and an adhesive taking roller in the coating roller is arranged in the PVDC emulsion groove and the adhesive groove. The invention also discloses a method for producing the medicinal polrvinyl chloride / polyvinylidene chloride composite sheet; due to adoption of the multiple short vertical tunnel and one long arch-shaped horizontal tunnel, the whole machine is reduced in size, the space of a plant is saved, and the baking and forced air drying speed of a coating tunnel is improved. By adopting the novel processing and coating dryer, the rate of qualified products is improved, the coating, baking and drying speeds are increased, and the cost is reduced.

Description

technical field [0001] The present invention relates to a new type of drying machine, in particular to a novel polyvinyl chloride / polyvinylidene chloride pharmaceutical composite sheet processing and coating drying machine; the present invention also relates to a production method of pharmaceutical composite sheet, in particular to A new type of polyvinyl chloride / polyvinylidene chloride pharmaceutical composite sheet processing coating dryer is used to produce polyvinyl chloride / polyvinylidene chloride pharmaceutical composite sheet method. Background technique [0002] Polyvinylidene chloride (PVDC) is a polymer material with excellent barrier properties, especially suitable for long-term packaging of food and pharmaceuticals. However, because of its relatively high crystallinity, it is difficult to use it as a plastic processing alone. At present, the original polyvinylidene chloride synthetic emulsion is used to coat and dry the film or to form a film on other polymer pl...

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Problems solved by technology

However, because of its relatively high crystallinity, it is difficult to use it as a plastic processing alone. At present, the original polyvinylidene chloride synthetic emulsion is used to coat and dry the film or to form a film on other polymer plastic sheets or films (such as polyvinyl chloride). PVC hard sheet or polypropylene PP film) is coated and dried to form a film and used for composite processing. For example, the expensive solid pharmaceutical blister packaging composite hard sheet PVC / PVDC is processed through this emulsion coating, drying, and film formation. produced by technology

However, the current technology of coating, processing and manufacturing this kind of composite hard sheet has the following disadvantages: the coating tunnel drier used is horizontal and horizontal, because the moisture of PVDC emulsion is difficult to volatilize and dry, and the speed and thoroughness of moisture drying directly affect The quality of PVDC macromolecule crystallization or the level of crystallinity is also related to the quality of the barrier property of the composite sheet. Therefore, in order to ensure smooth and thorough water volatilization and drying and a high level of PVDC crystallization density, the current lying The type coating tunnel dryer is used as a drying machine for coating PVDC emulsion in three stages: that is, the first layer is an adhesive primer to enhance the adhesion and adhesion with the substrate, and the next 2~4 layers are PVDC Emulsion coating and drying, the machine length of each section of heating and baking tunnel is long, the total length of the entire horizontal tunnel coating dryer exceeds 60 meters, the workshop building required to be built is long and large, and the investment cost from the machine to the factory building is very high High, the drying speed of coating and baking is still slow, and the product production efficiency is low

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