DE1604569A1 - Injection molds - Google Patents

Description

Bes.c h r ei Ta "'u η g:

for patent application = ^; / ^

of Imperial Chemical Industries Limited »London SWl» Engalnd * ^: concerning! ■ - ..

".- ■■". Injection molds

Priorities: September 6, 1965 and 2'5. August 1966 Great Britain ■

The invention relates to injection molds; and more particularly to the use of such injection molds for making book covers or book covers. The term "book covers" also includes folders, folded covers and the like · ■ ■; _; ; : ■ ....

Covers for books with hard covers are currently being grounded. in general made of cardboard and cloth such lids require several fabrication steps a before they are ready to be applied to the bound book. You own also a "low - 'lii'iders.tanäsf-Shiglceit- compared to liquids; many books in municipal lending libraries. become damaged by rain «It has therefore already been suggested

109887/0376

Manufacture of book spines by injection molding of tough thermoplastic materials such as polypropylene. The injection mold may simply consist of two Formelemten, one of which the surfaces of the Buhdeckel, the folding or hinge joints and the spine of the first page of the book cover, for example, inner, shaping _t while the other mold member the surfaces on the Buchedeekeln, the second Side of the book cover, for example the outside, forms. In this way, book covers can be produced in one operation at considerable speed and are thus ready to be connected to the bound book. The book covers are connected to the spine of the book in one piece; A folding is obtained by thin connecting strips between the book spine and the book cover. - ·

Paper for paper and therefore book covers come in standard sizes. However, since the authors have books of different lengths write, it is not possible to standardize the thickness of the books * according to the width of the spine.

Injection molds are expensive; Injection molding is cheap only when one mold can be used to make a large number of objects. Sine injection mold for each sub ^f schiedliche spine width can be prohibitively expensive for a particular book jerk width in some cases.

According to the invention, an injection mold is now to be created,

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the spine of a variable spine width or is capable of shaping ·. .

The invention therefore consists in the use of injection molding Forms on the spine of the book to accommodate interchangeable elements the form for book spines », Buehrüekenverbindungsbahnen and ■ Parts of the book cover areas »: ·

Preferably, the shape comprises two shape elements, with surfaces, the parts of the book cover surfaces on one side of the book cover form". the relative positions of the form elements being variable by alternating or exchangeable elements here the shape "which form a surface of the spine of the book". ·. -.

In particular, the invention is directed to an injection mold for book spine »consisting of a first formula meant with two surfaces »which are part of the two, book cover surfaces on the first page of the book cover and arranged so that they are in the middle between the ends the. , Interchangeable Fprmelemente surfaces in the middle, the the surfaces of book spines, flap or hinge elements and form the remaining parts of the book cover on the first page of the book cover », as well as two further form elements., each with a .Qlperilache * the thin part of a book cover surface on the second page of the book cover form the relative objects: can be changed to between these

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alternating form elements of different widths, the the surfaces of book spines. Hinged connection parts and the remaining parts of the book cover on the second page of the Make a book cover.

The method according to the invention for the production of book covers consists in a preferred manner of using a tough thermoplastic Polymer produced in a mold according to the invention by injection molding will"

A preferred embodiment of the invention is now intended for example explained in more detail with reference to the accompanying drawings become »in those

Fig. 1 is a perspective view of a book cover! manufactured after method according to the invention shows.

ig. 2 is a horizontal section through a shape according to FIG Invention, the form elements for the formation of book spines, Contains connecting hinged parts and parts of the book cover and that for forming a book spine of medium width (the section is along the line B-B in FIG laid). -

Fig. 3 is a vertical section along the line AA in Fig. 2. Fig. H is a horizontal section through the shape according to the

Fig. 2 and 3 »the elements 109887/0376" ⁵ "forming the spine

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for forming a narrow book spine.

According to Fig. 1, the book cover 5 of the book cover with the spine of the book on Buchrückehver bond tension 7 connected j; 8 and 9 are book cover 1 inside and book cover outside surfaces 5 10 and 11 are inside and outside book spine surfaces. · "" _ ,. /. - 1 .- ■ - ^": .i

According to the Fdig. 2 - k the mold is formed from an inner mold half-frame 12 which also serves as a mold element and forms part of the book cover surfaces on one side of the book cover and an outer mold half-frame 13, the latter has a base plate 14 and legs 15 ( Fig. 3) ». Between which two mold insert pieces l6 (Fig.2 and k) with flat mold surfaces (17) are fitted against which the book cover outer surfaces 9 of the book cover are formed during the molding process. Spacer pieces 18 (FIGS. 2 and 2 ) are embedded in the base plate, each of which is provided with an adjustable bolt 19 which rest against an outer surface of one of the mold insert pieces 16. The shaped element 20 with a surface 21 »which forms the outer surface 11 of the book spine fits smoothly between the two insert pieces 16. The surface 21 is concave and has. two parallel ribs 23, which produce a curved back 6 fastened via book spine connection s tracks 7. The frame 12 has two flat shape surfaces 2k _% which the

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form inner book cover surfaces 8 of the book cover; between these there is a groove or recess 25 "" - provided * "- ■ '■: ν which the shaped element 26 smoothly accommodates» which bears a shaped surface »which forms the inner book spine surface 10 of the book cover» the surface 27 is curved to match the surface 21. The form element 26 is fixed against the frame 12 by bolts 28. The form element 26 and frame 12 are provided with channels which form passages 29 for the introduction of molten thermoplastics a hold between the legs 15 of the frame 13

In operation, the mold shown in FIGS. 2 and 3 is inserted into an injection molding machine. When the mold is closed, the nozzle of the injection molding machine is brought to the web 30; Molten thermoplastic polymer is introduced into the mold under pressure · This pressure is maintained for a short time in order to completely fill the mold be repeated. If one wishes to change the production of book covers with narrower spines, the shaped elements 20 and 26 are removed and replaced by corresponding elements 31 and 32. The shaped elements 16 are allowed to rest smoothly against the element 31 by screwing in the bolts 19 further. The shape of this time is as shown in Fig. H, configured ist'der the operation same as before.

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For real estate professionals it is clear that the interpretation described is based on various ways can be modified, E.B. can other suitable means of stringing the removable and adjustable shape elements are used in their position. The design of the web can also be changed by the inflow takes place e.g. via another part of the mold. The strongest internal folding ν connections are created by the flow made so that the flow of the melted liquid Polymers through the mold via the folding or hinge line he follows.

The mold surfaces can be provided with a pattern, around the most diverse decorative effects, e.g. an imitation leather, evoke »You can / also embossed or ab- .be cut to be embossed or relief-like To produce writing on the spine of the book. It can be advantageous to roughen the surfaces forming the inner surfaces of the book cover so that a surface is created which can be glued more easily. Interchangeable book spine elements, which vary in a wide range. Letters can be used to mean different Book covers of the same shape. In a similar way, interchangeable elements of the mold can be used for the inside of the book, the attachments or "anchorages for attachments" form, in the form according to the invention

will. ^

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The preferred thermoplastic polymer for the production of book covers is crystalline polypropylene (including copolymers of propylene with small amounts of other monomers »ZeB * ethylene) · This leads to particularly strong, one-piece hinged joints · Other tough thermoplastic polymers such as polyethylene, nylon , polyvinyl chloride or poly-crystalline · ^ f-Me thy lpenten-1 or copolymers of ^1-Me thy J lpent en-1 with a minor proportion of at least one alpha-olefin comprising 5 - contains 18 carbon atoms, can be used.

- patent claims -

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Claims (2)

Pat en t a ns ρ r ü eh e: Application of injection molds to the manufacture of Book spine to accommodate interchangeable elements of the form that lead to book spines, book spine connection strips and parts of the book cover surfaces. 2. Injection mold for book covers according to claim 1, marked « characterized by two elements of form, with surfaces that Parts of the book cover surfaces on one side of the book cover form, the relative positions of these form elements being variable and interchangeable form elements that form a surface of the book spine, accommodate. . 3 · Injection mold for book spines, marked by a First form element with two surfaces, the parts of two book cover surfaces on a first page of the book cover form and are set up midway between the ends of the Surfaces interchangeable to accommodate elements of the form, which form the surfaces · of the spine of the book, the hinged connection and the other parts of the covers on the first side of the book spine, as well as two further form elements, each with "a surface forming Part of a book cover surface on the second bottom of the book cover, whose relative positions can be changed to differentiate between interchangeable molded elements Width, the dia surfaces of book spines, connecting strips or hinges and the other parts of the book - 10 - form the cover on the second page of the book cover * f. Injection mold according to one of Claims 1 to 3, characterized characterized in that the web and the inlet channels are arranged are assured that the flow of molten material through the mold is over the fold or hinge line he follows. 5 · Process for the production of book covers, characterized in that, that a tough, thermoplastic polymer in a mold according to one of the preceding claims by injection molding is shaped. · PATEHTANWXin HNCKe Dlrt.4N ©. DIPL-ING. f. HASOiR 109887/0376 Lee rseHe