Medicinal plastic bottle optimization design essentials

Among the many plastic packaging bottles, plastic bottles are the most widely used type of packaging containers, and they are widely used in pharmaceutical packaging. The reason why plastic bottles are widely used is that they have a series of advantages such as light weight, durability, good barrier property, easy molding, variable shape, and low cost, and they are very competitive in the packaging industry.
With the rapid development of China's pharmaceutical industry, the pharmaceutical packaging industry has begun to move forward and become an important part of the development of China's pharmaceutical industry. At present, the overall technical level of China's pharmaceutical packaging industry is not high, lagging far behind the developed countries. In the developed countries, pharmaceutical packaging accounts for 30% of the drug value, but China is still less than 10%. In the next five years, it will still be a critical period for the rapid development of China's pharmaceutical industry, and it is tempting for huge business opportunities. Among the many factors of commodity competition in the international market, product quality, price, and packaging design are the three main factors. As a foreign marketing expert said: “In the path to the market, packaging design is the most important one, packaging plays a role in the overall image of the product as much as advertising.” So we must seize this opportunity for development. , brave to innovate, unconventional, make the product novel, bizarre, full of modern consciousness

The ability to develop and manufacture competitive products is the key to business survival and development. The birth of competitive products starts with the optimal design of the product.

The first point of optimization design: It must be understood that plastic bottles should have the following functions.

1) The plastic bottle must have the function of protecting the contents. The plastic bottle can be protected against moisture, water, dust and corrosion. Blocking of dust, water, and other liquid substances from outside; Preventing contamination and corrosion of packaging materials; Preventing penetration of UV rays, adapting to changes in ambient temperature, and protecting packages from sunlight and UV rays.

2) The plastic bottle must have the function to withstand the external force. It can adapt to a variety of transportation methods and storage methods, and protect the contents from damage.

3) The plastic bottle makes the product display function. The plastic bottle can display the display function of the product through beautiful appearance, vivid colors, smooth surface and transparency. Attract customers and stimulate customers' desire to buy.

For example, bottles of different colors can clearly indicate the series, type, or model of the product. The clear plastic bottle can show the color and quality of the contents; the translucent plastic bottle shows or conceal the contents of the content; the opaque plastic bottle cans. Load items with various colors. Printed on the surface of plastic bottles, the printed information can be passed directly to consumers.

Plastic bottles should have easy-to-use features. The opening of plastic bottles should be designed to be easy to open, open and closed multiple times, and easy to dump the contents. Can not cause spatter injury. When designing a product, additional functions can be added to the sealer: eg, anti-counterfeit, anti-theft, anti-blocking, spray, etc.

The second point of optimization design is that at the beginning of product design, designers must conduct market research, specify customer requirements, learn the longevity of similar products in the industry, be familiar with the molding equipment and production technology level of the company, and establish the design products. Preliminary concept.

The third point of optimization design: According to various technical materials, my own design experience and imagination, material formula, molding process, unconventional. The courage to innovate and design product drawings, product renderings or models to form a preliminary design. Design considerations include: product stiffness and shape design, printed surface design, edge and wipe design, bottle design, and bottom design.

Plastic bottles should have sufficient rigidity and aesthetic appearance. The most common shapes of plastic bottles are round, square, oval and so on. From the use point of view, they have their own advantages and disadvantages. The round plastic bottle has a high stiffness, but its appearance is not beautiful. The shape of the square plastic bottle is beautiful, but it is not easy to control the wall thickness of the plastic bottle when molding. Oval-shaped plastic bottles are also high in rigidity, but the manufacturing cost of the molds is high. Therefore, in order to ensure the rigidity of the plastic bottle, besides selecting a material with high rigidity, the shape of the plastic bottle must be designed to enhance the rigidity and load-resistant strength of the plastic bottle.

1) Change the surface shape of the plastic bottle, for example, the middle of the plastic bottle is relatively small. To increase the circumferential groove or ribs of the plastic bottle can increase the rigidity and bending resistance of the plastic bottle. Longitudinal grooves or ribs eliminate plastic bottle deflection, sagging or deformation under long-term loading.

2) In the design of extruded plastic bottles, if the material is high-density polyethylene or polypropylene, the cross-section of the plastic bottle should be rectangular or oval, for the material is low-density polyethylene or other flexible plastic bottle, its cross-section Take a round shape as well. This facilitates the extrusion of the contents from the plastic bottle.

3) In order to make the plastic bottle wall thickness uniform, it should be noted that the shape of the plastic bottle should have symmetry. Minimize extreme stretch points and locations. All transitions use circular transitions.

4) The printing surface of plastic bottles is the most concentrated part of consumers' attention. The printing surface should be flat and continuous; if the plastic bottle contains handles, grooves, ribs, etc., the design should be careful not to cause inconvenience to the printing operation.

5) When the surface of the plastic bottle is labelled, the label surface should be flat. A "sash" can be designed on the surface of the plastic bottle so that the tag can be accurately positioned without movement.

6) At the time of blow molding, the place where the parison inflates first contacts always tends to harden in advance. Therefore, the wall thickness of this part is also larger. The edges and corners are the parts where the parison is inflated last, and the wall thickness is smaller. Therefore, the edge of the plastic bottle and the corner should be rounded.

7) Since most plastics have notch sensitivity, plastic bottles are susceptible to cracking and cracking at sharp corners, the roots of the mouth thread, and the neck, so these parts should be rounded. For the transfer of rectangular plastic bottles, most of the load of the plastic bottles needs to be supported. Therefore, the wall thickness at that part is locally increased, which is also advantageous for improving the rigidity and load-bearing strength of the plastic bottles. The plastic parts used with the plastic bottle mouth are mainly caps and sealers. The design of the plastic bottle mouth should focus on examination; how to make the plastic bottle mouth fit the bottom of the plastic bottle with the lid and the sealer better is the weak part of the mechanical performance of the plastic bottle. Therefore, the bottom of the plastic bottle is generally designed to be concave; the corners of the plastic bottle, as well as the inner cavity, are all subject to large arc oversizing. In order to facilitate the stacking of plastic bottles and increase the stacking stability of plastic bottles, the bottom of plastic bottles should be designed with inner grooves.

The fourth point of optimizing the design is to extensively listen to everyone's comments on the preliminary design, and make repeated modifications after repeated modifications. Including the product after the trial change, the customer's final modification, until the final confirmation of the type. Plastics have a variety of molding methods and they can all be used to make plastic bottles of different shapes and purposes. Among them, blow molding is one of the most widely used and one of the largest production methods. Extrusion blow molding is the earliest and most used process method for producing plastic blow-molded plastic bottles. Its processes include the extrusion of plastics, the preparation of parisons, the inflation and cooling of parisons, the opening of molds and the removal of products. Products that have been demolded, according to the design requirements, need to be processed and tested. Stretch blow molding, also known as biaxial orientation blow molding. It is used to make thermoplastics by extrusion or injection process into parisons, tempered, so that the parison is in the high elastic state of polymer, advanced