Double-bubble blown film moulding method for producing polyester thermal contraction film

A technology of heat-shrinkable film and molding method, which is applied in the field of double-bubble blown film forming of heat-shrinkable polyester film, can solve problems such as high product cost, lack of flexibility and adaptability, and lack of market competitive advantages, and achieve Reduce the overall cost of products, enhance market competitiveness, and easily adjust product specifications
CN101502997AInactive Publication Date: 2009-08-12BEIJING UNIV OF CHEM TECH +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
BEIJING UNIV OF CHEM TECH
Publication Date
2009-08-12
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a double bubble blow-molding film molding method of polyester heat-shrinkable film, belonging to the processing field of polymer materials. Polyester material is fed into a single-screw extrusion machine to carry out plasticizing extrusion after being dried, and a first film bubble is obtained after being blew by a blowing mould ram head, the first bubble is formed into a first bubble double-bending film through a first gable and a first pull roll, and secondary blowing is carried out to obtain a second film bubble for quenching molding after secondary heating is carried out to be in elastomeric state between Tg and Tf (Tg being a vitrification temperature, and Tf being a fusion temperature) through a second pull roll and a heating device, a second bubble double-blending film is formed through a second gable and a third pull roll and lastly taken up to obtain the polyester heat-shrinkable film. Compared with the existing flat film stretching method, the invention has the characteristics of small equipment investment, easy regulation for product standard and strong flexibility, and is applied to heat-shrinkable extension type label or goods package of containers.
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Description

technical field

[0001] The invention belongs to the field of polymer material processing, and relates to a forming method of a heat-shrinkable polyester film, more specifically, to a heat-shrinkable polyester film suitable for a heat-shrinkable sleeve label of a container or an article package double bubble blown film forming method. Background technique

[0002] At present, the materials used to manufacture heat-shrinkable sleeve labels include polyvinyl chloride (PVC), polystyrene (PS) heat-shrinkable films, and the like. PVC heat-shrinkable film has good shrinkability, and it is not easy to wrinkle when shrinking. It can meet the packaging requirements of containers of various shapes and has a wide range of applications. The cheapest of membrane materials. However, the light stability and thermal stability of PVC are poor, and the decomposition product vinyl chloride monomer during heating has been listed as a carcinogen by the medical profession; its waste will produce...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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